RBSE Solutions Class 12 Economics Chapter 3 Concept of Demand

RBSE Class 12 Economics Chapter 3 Multiple Choice Questions

 

Question 1. Demand for a commodity shows a relationship between quantity demanded and its prices.
(a) positive
(b) infinite
(c) zero
(d) inverse
Answer: (d) inverse
In simple words: The demand for an item changes in the opposite way to its price; if the price goes up, demand goes down, and vice versa.

🎯 Exam Tip: Remember that the law of demand typically shows an inverse relationship between price and quantity demanded, assuming other factors remain constant.

 

Question 3. Extension and contraction of demand is due to the :
(a) Change in the price of the commodity itself
(b) Change in the price of other commodities
(c) Change in taste and preferences of consumers
(d) Change in income of consumers
Answer: (a) Change in the price of the commodity itself
In simple words: When the demand for something goes up or down because its own price changes, that's called extension or contraction of demand.

🎯 Exam Tip: Distinguish between 'extension/contraction' (movement along the curve due to price changes) and 'increase/decrease' (shift of the curve due to non-price factors).

 

Question 4. If demand function of a commodity is \( D_x = 35 - 4 (P_x) \) and its price is Rs 5 per unit, the demand would be :
(a) 20
(b) 15
(c) 35
(d) 0
Answer: (b) 15
In simple words: To find the demand, put the price of Rs 5 into the demand formula \( D_x = 35 - 4 (P_x) \). This calculation will tell you how many units are demanded at that price.

🎯 Exam Tip: Always substitute the given price into the demand function carefully to calculate the quantity demanded accurately.

 

Question 5. On what type of goods, law of demand does not apply?
(a) Giffen goods
(b) Normal goods
(c) Substitute goods
(d) Complementary goods
Answer: (a) Giffen goods
In simple words: Giffen goods are special types of inferior goods where if their price goes up, people actually demand more of them, which is the opposite of the usual law of demand.

🎯 Exam Tip: Remember Giffen goods as a key exception to the law of demand where the income effect outweighs the substitution effect.

RBSE Class 12 Economics Chapter 3 Very Short Answer Type Questions

 

Question 1. What are giffen goods?
Answer: Giffen goods are special kinds of inferior goods. For these goods, when their price goes up, people demand more of them. Conversely, if their price falls, people demand less. This is unusual and goes against the typical law of demand.
In simple words: Giffen goods are items where people buy more if the price increases, and less if the price decreases.

🎯 Exam Tip: Clearly state the inverse relationship of Giffen goods to the law of demand and mention their characteristic as inferior goods.

 

Question 3. How is market demand curve obtained from individual demand curves?
Answer: The market demand curve is made by adding up all the individual demand curves horizontally. This means at each price, you sum the quantity demanded by every individual consumer to get the total market demand.
In simple words: You get the market demand curve by adding up what everyone wants to buy at each price.

🎯 Exam Tip: Remember that market demand is the sum of individual demands, and it's always a horizontal summation.

 

Question 4. Due to increase in income of a consumer, if he increases the quantity demand, then what type of goods is it?
Answer: If a consumer's income increases and they buy more of a certain good, that good is considered a luxury good. This often happens with items that are not essential but desirable.
In simple words: If you buy more of something because you have more money, it's a luxury item.

🎯 Exam Tip: Clearly define the positive relationship between income and demand for luxury goods, contrasting them with normal or inferior goods.

 

Question 5. If demand curve shifts leftwards due to increased income, then what will it be called?
Answer: If the demand curve shifts leftwards even when income increases, it indicates a decrease in demand for that good. This typically happens with inferior goods, which people buy less of as their income rises.
In simple words: When a demand curve moves left even with more money, it means people want less of that item.

🎯 Exam Tip: A leftward shift indicates a decrease in demand, often seen with inferior goods when income rises.

RBSE Class 12 Economics Chapter 3 Short Answer Type Questions

 

Question 1. Explain diagrammatically the movement along a demand curve and shift in demand curve.
Answer: Movement along a demand curve is of two main types:
(i) **Extension of Demand:** This happens when the quantity demanded of a product increases only because its price has decreased, while all other factors remain constant. For example, if chocolate costs Rs 5, one chocolate is bought. If the price drops to Rs 1, demand goes up to 5 chocolates.

This extension of demand is shown by moving along the same demand curve, from point A to B on curve-D in the diagram below.
(ii) **Contraction of Demand:** This is the opposite, where the quantity demanded of a product decreases because its price has risen. All other factors are kept the same. For example, if chocolate costs Rs 1, demand is for 5 chocolates. If the price goes up to Rs 5, demand shrinks to only 1 chocolate. Contraction of demand is also shown by moving along the same demand curve, from point B to A on curve DD' in the diagram below.
**Shift in Demand Curve (Change in Demand):** This happens when the entire demand curve moves either to the right (increase in demand) or to the left (decrease in demand). This shift is caused by changes in factors *other than* the good's own price, such as income, tastes, prices of related goods, expectations, etc.
(i) **Increase in Demand:** This means consumers want to buy more of a product at its current price, or even at a higher price. This is due to non-price factors changing positively. For example, if at Rs 10 per unit, demand increases from 20 units to 30 units because of a rise in income or popularity. This is shown as the demand curve shifting from \( D_1 \) to \( D_2 \) in the diagram below. The consumer moves from point A on \( D_1 \) to point B on \( D_2 \). This is also called a forward shift in the demand curve.
(ii) **Decrease in Demand:** This means consumers buy less of a product at its current price. This happens due to negative changes in non-price factors. For example, if at Rs 10 per unit, demand decreases from 30 units to 20 units. This decrease in demand causes the demand curve to shift to the left, which is also called the Backward shift in the Demand Curve.
In simple words: Movement along a curve means demand changes only because the price changes (extension or contraction). A shift in the curve means demand changes due to other reasons like income or fashion (increase or decrease).

🎯 Exam Tip: Clearly differentiate between movement along the demand curve (caused by price changes) and shifts of the demand curve (caused by non-price factors), illustrating each with separate diagrams and examples.

 

Question 2. Differentiate between normal goods and inferior goods.
Answer: **Normal Goods:** These are goods for which demand increases when a consumer's income rises, and decreases when income falls, assuming the price of the goods stays the same. Examples include wheat, grains, sugar, and branded clothes.
**Inferior Goods:** These are goods for which demand decreases when a consumer's income rises. People buy less of these goods as they become richer. For instance, if income increases, people might switch from cheaper breads or cereals to more nutritious and expensive foods, causing demand for the low-priced options to fall.
In simple words: Normal goods are bought more as you earn more, while inferior goods are bought less as you earn more.

🎯 Exam Tip: Remember that the key difference between normal and inferior goods lies in how their demand changes with a change in consumer income.

 

Question 3. If X is a commodity and Y is its substitute commodity, then what will be the effect of decrease in the price of Y commodity on the demand for commodity X? Explain with the help of a diagram.
Answer: If commodity Y is a substitute for commodity X, and the price of commodity Y decreases, consumers will tend to buy more of the cheaper commodity Y instead of commodity X. This is known as the substitution effect. As a result, the demand for commodity X will decrease.
The diagram below illustrates this: When the price of commodity Y was OP, the demand for commodity X was OQ. When the price of commodity Y decreases to \( OP_1 \), the demand for commodity X decreases to \( OQ_1 \). This shows that the demand curve for substitute goods has a positive slope, implying a direct relationship between the price of the substitute and the demand for the original good.
In simple words: When a substitute good becomes cheaper, people buy less of the original good because they switch to the cheaper option.

🎯 Exam Tip: When dealing with substitutes, remember that a decrease in the price of one will decrease the demand for the other, causing a leftward shift in its demand curve.

RBSE Class 12 Economics Chapter 3 Essay Type Questions

 

Question 1. Explain the law of demand with the help of schedule and diagram.
Answer: The Law of Demand states that if all other factors remain constant, the quantity demanded of a good increases as its price falls, and decreases as its price rises. This shows an inverse relationship between the price of a commodity and the quantity demanded, provided other factors that influence demand do not change.
The law of demand can be explained using a demand schedule and a demand curve:
**Demand Schedule:**

This schedule shows that as the price of the commodity decreases (e.g., from Rs 6 to Rs 5), the quantity demanded increases (from 100 to 200 units).
**Demand Diagram:**
The diagram visually represents the demand schedule, showing the demand curve sloping downwards from left to right. This downward slope confirms the inverse relationship: as price decreases, demand increases, and vice versa.
In simple words: The law of demand means that people buy more of something when it's cheaper, and less when it's expensive. A table and a drawing (demand curve) show this clearly.

🎯 Exam Tip: To explain the law of demand fully, always include both the definition (inverse relationship), a numerical schedule, and a downward-sloping demand curve diagram.

 

Question 2. Differentiate between change in demand and change in quantity demanded for a demand curve.
Answer:**Change in Quantity Demanded (Movement Along a Demand Curve):** This refers to an increase or decrease in the amount of a good purchased *only* because of a change in its own price, while all other factors (like income, tastes, prices of other goods) remain constant. This change is shown as a movement along the existing demand curve. It has two types:
(a) **Extension of Demand:** This is when the quantity demanded increases because the price of the good falls. For example, if a chocolate's price drops from Rs 5 to Rs 1, demand rises from 1 to 5 chocolates.

This is shown by a movement from point B to A on the demand curve DD' in the diagram below.
(b) **Contraction of Demand:** This is when the quantity demanded decreases because the price of the good rises. If the price of chocolate rises from Rs 1 to Rs 5, demand falls from 5 to 1 chocolate. Contraction of demand is also shown by a movement along the same demand curve, from point A to B on curve D in the diagram below.
**Shift in Demand Curve (Change in Demand):** This happens when the entire demand curve moves either to the right (increase in demand) or to the left (decrease in demand). This shift is caused by changes in factors *other than* the good's own price, such as income, tastes, prices of related goods, expectations, etc.
(i) **Increase in Demand:** This means consumers want to buy more of a product at its current price, or even at a higher price. This is due to non-price factors changing positively. For example, if at Rs 10 per unit, demand increases from 20 units to 30 units because of a rise in income or popularity. This is shown as the demand curve shifting from \( D_1 \) to \( D_2 \) in the diagram below. The consumer moves from point A on \( D_1 \) to point B on \( D_2 \). This is also called a forward shift in the demand curve.
(ii) **Decrease in Demand:** This means consumers buy less of a product at its current price. This happens due to negative changes in non-price factors. For example, if at Rs 10 per unit, demand decreases from 30 units to 20 units. This decrease in demand causes the demand curve to shift to the left, which is also called the Backward shift in the Demand Curve.
In simple words: Movement along a curve means demand changes only because the price changes (extension or contraction). A shift in the curve means demand changes due to other reasons like income or trends, causing the entire demand curve to shift.

🎯 Exam Tip: Clearly differentiate between movement along the demand curve (caused by price changes) and shifts of the demand curve (caused by non-price factors), illustrating each with separate diagrams and examples.

 

Question 3. Explain the effects on demand of a commodity due to:
(i) Increase in income
(ii) Increase in prices of related goods
Answer:
(i) **Effect of Increase in Income:** When a consumer's income rises, and all other factors (like tastes, prices of related goods) remain unchanged, their demand for most commodities tends to increase. This is especially true for normal goods. A higher income means more purchasing power, leading consumers to buy more branded clothes, eat out more, and shop more. As a result of this increased demand, the entire demand curve for these goods shifts outwards, or to the right.
(ii) **Effect of Increase in Prices of Related Goods:** The impact of a change in the price of related goods on demand is called the Cross-Price Effect. Related goods can be substitutes or complements.
- **Substitute Goods:** If the price of a substitute good increases (e.g., coffee), consumers might switch to a relatively cheaper alternative (e.g., tea). This would cause the demand for tea to increase, shifting its demand curve to the right.
- **Complementary Goods:** If the price of a complementary good increases (e.g., petrol), the demand for goods used with it (e.g., cars) will decrease.
The diagram below illustrates the effect of an increase in the price of a substitute (coffee) on the demand for tea.
Initially, you bought \( OT_1 \) quantity of tea at price \( P_1 K_1 \). Now, even with the tea price staying at \( P_1 \), you are willing to buy \( OT_2 \) quantity of tea, which is \( P_1 K_2 \). This greater purchase at a constant price shows an increase in demand or a forward shift in the demand curve from \( D_1 \) to \( D_2 \).
In simple words: If your income goes up, you buy more of normal goods (demand curve shifts right). If the price of a related good goes up, your demand for that item can change. For substitutes, if one gets expensive, you buy more of the other (demand shifts right).

🎯 Exam Tip: Remember to differentiate between how income affects normal vs. inferior goods, and how price changes in substitutes versus complements affect demand for the main commodity.

 

Question 1. Demand for a commodity refers to :
(a) desire for the commodity
(b) need for the commodity
(c) quantity demanded of that commodity
(d) quantity of the commodity demanded at a certain price during any particular period of time
Answer: (d) quantity of the commodity demanded at a certain price during any particular period of time
In simple words: Demand means how much of an item people are willing and able to buy at a specific price, at a certain time.

🎯 Exam Tip: Define demand precisely by including both the willingness and ability to purchase, and specifying a price and time period.

 

Question 2. Contraction of demand is the result of :
(a) decrease in the number of Consumers
(b) increase in the price of the good concerned
(c) decrease in the prices of other goods
(d) decrease in the income of purchasers
Answer: (b) increase in the price of the good concerned
In simple words: When the price of an item goes up, people usually buy less of it; this decrease in buying is called contraction of demand.

🎯 Exam Tip: Contraction of demand is a movement *along* the demand curve, caused solely by a rise in the good's own price.

 

Question 3. All but one of the following are assumed to remain the same while drawing an individual's demand curve for a commodity. Which one is it?
(a) The preference of the individual
(b) His monetary income
(c) Price
(d) Price of related goods
Answer: (c) Price
In simple words: When we draw a demand curve for one person, we usually assume things like their tastes, income, and prices of other goods don't change. The only thing that changes is the price of the item itself.

🎯 Exam Tip: Remember the 'ceteris paribus' (all else equal) assumption when drawing a demand curve; only the price of the good itself changes along the curve.

 

Question 4. Which of the following pairs of goods is an example of substitutes?
(a) Tea and Sugar
(b) Tea and Coffee
(c) Pen and Ink
(d) Chint and Tr
Answer: (b) Tea and Coffee
In simple words: Substitute goods are items that can be used in place of each other, like tea and coffee.

🎯 Exam Tip: Understand that substitute goods fulfill a similar need, so an increase in the price of one often leads to increased demand for the other.

 

Question 5. In drawing an individual's demand curve, the implicit assumption is that there is an inverse relationship between:
(a) income of the consumer and the quantity of a good demanded by him
(b) price of a good and the quantity demanded
(c) price of a good and the demand for its substitute
(d) quantity demanded of a good and the relative prices of its complementary goods
Answer: (b) price of a good and the quantity demanded
In simple words: The demand curve shows how the price of an item and the quantity people want to buy usually move in opposite directions.

🎯 Exam Tip: The fundamental law of demand states an inverse relationship between the price of a good and the quantity demanded, holding all other factors constant.

 

Question 6. If regardless of changes in its price, the quantity demanded of a good remains unchanged, then the demand curve for the good will be :
(a) horizontal
(b) vertical
(c) positively sloped
(d) negatively sloped
Answer: (b) vertical
In simple words: If people buy the same amount of something no matter what its price is, the demand curve for that item will be a straight line going up and down.

🎯 Exam Tip: A vertical demand curve indicates perfectly inelastic demand, meaning quantity demanded does not respond to price changes.

 

Question 7. The law of demand is:
(a) a quantitative statement
(b) a qualitative statement
(c) both a quantitative and a qualitative statement
(d) neither a quantitative nor a qualitative statement
Answer: (b) a qualitative statement
In simple words: The law of demand tells us *how* demand changes with price (inversely), but not by *how much*.

🎯 Exam Tip: Remember that the law of demand describes the direction of change (qualitative), not the magnitude (quantitative), which is addressed by elasticity.

 

Question 8. All of the following are determinants of demand except:
(a) tastes and preferences
(b) quantity, supplied
(c) income
(d) price of related goods
Answer: (b) quantity, supplied
In simple words: Demand is affected by things like what people like, how much money they have, and prices of other goods, but not by how much of the item is available from sellers.

🎯 Exam Tip: Distinguish between factors affecting demand (consumer side) and factors affecting supply (producer side).

 

Question 10. If the price of Pepsi decreases relative to the price of Coke and 7-UP, the demand for :
(a) Coke will decrease
(b) 7-UP will decrease
(c) Coke and 7-UP will increase
(d) Coke and 7-UP will decrease
Answer: (d) Coke and 7-UP will decrease
In simple words: When the price of Pepsi, a substitute drink, goes down, people will buy more Pepsi. This means they will buy less Coke and 7-UP, causing their demand to drop.

🎯 Exam Tip: Remember that substitute goods have a direct relationship between the price of one and the demand for the other. When one gets cheaper, demand for its substitutes falls.

 

Question 11. According to ................ "Law of Demand states people will buy more at lower prices and buy less at higher prices, other things remaining the same".
(a) Prof. Marshall
(b) Prof. Ferguson
(c) Prof. Samuelson
(d) Bilas
Answer: (c) Prof. Samuelson
In simple words: This statement about the law of demand, where people buy more when prices are low and less when prices are high, comes from Professor Samuelson.

🎯 Exam Tip: Familiarize yourself with key economic definitions and their originators to correctly identify economists associated with specific laws or theories.

 

Question 12. Goods having negative price effect and positive income-effect are known as :
(a) inferior goods
(b) normal goods
(c) substitute goods
(d) complementary goods
Answer: (b) normal goods
In simple words: Normal goods are items that people buy more of when their income increases, and their demand usually goes down when their price increases.

🎯 Exam Tip: Understand the difference between normal and inferior goods based on how changes in income and price affect their demand.

 

Question 14. Inferior goods having negative income effect and positive price effect are called ................ goods.
(a) inferior goods
(b) giffen goods
(c) substitute goods
(d) complementary goods
Answer: (b) giffen goods
In simple words: Giffen goods are a special type of inferior goods. For these goods, when their price goes up, people buy more of them, which is unusual. This is because people cannot afford better alternatives.

🎯 Exam Tip: Giffen goods are a rare exception to the law of demand. Remember their unique characteristics: demand increases with price, and they are always inferior goods.

 

Question 15. Goods jointly consumed or collectively satisfying our wants are known as :
(a) inferior goods
(b) normal goods
(c) substitute goods
(d) complementary goods
Answer: (d) complementary goods
In simple words: Complementary goods are products that are used together, like a car and petrol, or tea and sugar. You usually need both to satisfy a want.

🎯 Exam Tip: Identify complementary goods by thinking if consuming one item makes you also want to consume another item. If they are used together, they are complements.

 

Question 16. Goods used in place of each other are :
(a) inferior goods
(b) normal goods
(c) substitute goods
(d) complementary goods
Answer: (c) substitute goods
In simple words: Substitute goods are products that can be used instead of each other, like tea instead of coffee. If the price of one goes up, people might buy more of the other.

🎯 Exam Tip: When one product can easily replace another to satisfy the same need, they are substitutes. This impacts how their demand changes with price fluctuations.

 

Question 17. An individual demand curve slopes downward to the right because :
(a) income effect of fall in price
(b) substitution effect of decrease in price
(c) Both (a) and (b)
(d) None of the options
Answer: (c) Both (a) and (b)
In simple words: A demand curve slopes downwards because when prices fall, people feel richer (income effect) and the product becomes cheaper compared to others (substitution effect), both leading them to buy more.

🎯 Exam Tip: Remember that both the income effect and the substitution effect contribute to the downward slope of the demand curve, except for Giffen goods.

 

Question 18. A giffen good is one whose demand increases, other things remaining the same, when :
(a) its price increase
(b) consumer's income increases
(c) price of its superior substitutes decreases
(d) None of the options
Answer: (a) its price increase
In simple words: A Giffen good is unique because its demand goes up when its price rises, which is the opposite of most goods. This happens when people are very poor and cannot afford other items.

🎯 Exam Tip: Giffen goods are a rare exception to the law of demand. The defining characteristic is a positive relationship between price and quantity demanded.

 

Question 19. An upward shift in the demand curve for a product is caused by which of the following ?
(a) Decrease in price of the products
(b) Increase in consumer's income
(c) Fall in the price of substitutes
(d) None of the options
Answer: (b) Increase in consumer's income
In simple words: An upward shift in the demand curve means people want to buy more of a product at every price. This often happens if their income goes up and the product is a normal good.

🎯 Exam Tip: A shift in the demand curve (upward or downward) is caused by factors *other than* the product's own price, such as income, tastes, or prices of related goods.

 

Question 20. Market demand is :
(a) Horizontal summation of individual's demand in the market
(b) Vertical summation of individual's demand in the market
(c) Diagonal summation of individual's demand in the market
(d) Multiplication of individual's demand in the market with price
Answer: (a) Horizontal summation of individual's demand in the market
In simple words: Market demand is found by adding up how much each person in the market wants to buy at a certain price. You add these amounts across, like horizontally.

🎯 Exam Tip: To get the total market demand at any given price, simply sum the quantities demanded by all individual consumers at that price.

 

Question 21. Which of the following can be regarded as an exception to the law of demand?
(a) Cases of snob appeal (e.g.jewels)
(b) Cases in which consumer judges quality by price
(c) Cases of giffen goods
(d) All of the options
Answer: (d) All of the options
In simple words: The law of demand usually says that when prices go up, demand goes down. But for luxury items (snob appeal), things people buy because they think higher price means better quality, or Giffen goods, this rule does not hold true.

🎯 Exam Tip: Recognize common exceptions to the law of demand, where the inverse relationship between price and quantity demanded does not apply. These are often high-value items, perceived quality-based pricing, or essential goods for the very poor (Giffen goods).

 

Question 2. Mention two factors which influence the demand for a commodity.
Answer: Two factors that influence the demand for a product are the income of the consumer and the price of a related product. For example, if income goes up, people might buy more luxury items.
In simple words: A person's income and the price of other similar items can change how much of a product they want to buy.

🎯 Exam Tip: When listing factors influencing demand, focus on key non-price determinants like income, tastes, and prices of substitute or complementary goods.

 

Question 3. What is a demand curve?
Answer: A demand curve is a drawing that shows how much of a product a buyer will want at different prices over a certain time. It helps visualize the relationship between price and quantity.
In simple words: A demand curve is a graph that shows how many items people will buy at different prices.

🎯 Exam Tip: A demand curve visually represents the law of demand, typically sloping downwards to show that higher prices lead to lower quantities demanded.

 

Question 4. Explain the circumstances in which demand curve slopes upwards.
Answer: A demand curve slopes upwards when the demand for an item increases as its price rises, and decreases when its price falls. This unusual behavior happens for certain goods like Giffen goods, showing a direct relationship. For example, during times of poverty, people might buy more basic necessities like potatoes even if their price increases because they can't afford expensive meat. The increase in price reduces their real income, forcing them to spend more on the cheaper staple.
In simple words: Sometimes, a demand curve goes up instead of down. This means people buy more of an item even if its price goes up, usually for very basic goods when they are poor.

🎯 Exam Tip: An upward-sloping demand curve is a rare exception to the general rule, primarily seen with Giffen goods where the income effect outweighs the substitution effect.

 

Question 5. Why are goods demanded?
Answer: Goods and services are demanded because they can fulfill our needs and wants. The power to satisfy human desire is called 'Utility'. Therefore, items are desired because they have utility.
In simple words: People want goods because these goods are useful and can satisfy their needs or wants.

🎯 Exam Tip: The fundamental reason for demand is the utility a good or service provides, meaning its ability to satisfy a human want or need.

 

Question 6. How do we distinguish between related goods and unrelated goods?
Answer: Goods are related when a change in the price of one affects the demand for the other. For instance, if coffee prices rise, demand for tea might increase, making them related goods. Unrelated goods are those where the demand for one is not affected by changes in the price of the other, like shoes and sugar.
In simple words: Related goods influence each other's demand based on price changes. Unrelated goods do not affect each other's demand.

🎯 Exam Tip: Differentiate related goods into substitutes (demand for one increases if the other's price rises) and complements (demand for one decreases if the other's price rises).

 

Question 7. How can we say effect of income is positive or negative?
Answer: The effect of income is positive when a rise in income leads to an increase in demand. This happens with normal goods. The effect is negative when higher income causes a decrease in demand, which is typical for inferior goods.
In simple words: Income has a positive effect when you buy more as your income rises (normal goods). It has a negative effect when you buy less as your income rises (inferior goods).

🎯 Exam Tip: The income effect helps classify goods as normal or inferior. A positive income effect means normal goods, while a negative income effect points to inferior goods.

 

Question 8. What is the slope of demand curve for giffen goods?
Answer: The demand curve for Giffen goods slopes upwards. This is different from most goods where the demand curve slopes downwards.
In simple words: For Giffen goods, the demand curve goes up, meaning more is bought at a higher price.

🎯 Exam Tip: An upward-sloping demand curve is a key characteristic of Giffen goods, making them an exception to the law of demand.

 

Question 9. What is demand schedule?
Answer: A demand schedule is a table that shows the different amounts of a product that buyers want to purchase at various prices, assuming other factors remain constant.
In simple words: A demand schedule is a list or table that shows how much of something people will buy at different prices.

🎯 Exam Tip: A demand schedule is a tabular representation of the relationship between price and quantity demanded, forming the basis for a demand curve.

 

Question 10. What is meant by extension of demand?
Answer: Extension of demand means that when the price of an item falls, people buy more of it, with all other factors staying the same. This is represented as a movement down along the same demand curve.
In simple words: Extension of demand happens when you buy more of something because its price has dropped, and nothing else has changed.

🎯 Exam Tip: Extension of demand refers to a movement along a single demand curve, triggered solely by a decrease in the product's own price.

 

Question 11. What is meant by contraction of demand?
Answer: Contraction of demand means that when the price of an item increases, people buy less of it, with all other factors remaining unchanged. This is represented as a movement up along the same demand curve.
In simple words: Contraction of demand happens when you buy less of something because its price has gone up, and everything else is the same.

🎯 Exam Tip: Contraction of demand is a movement along a single demand curve, caused solely by an increase in the product's own price.

 

Question 12. What is meant by complementary goods?
Answer: Complementary goods are products that are often used together, such as a pen and ink or bread and butter. The demand for one typically affects the demand for the other.
In simple words: Complementary goods are items that go hand-in-hand, so you usually use them together.

🎯 Exam Tip: For complementary goods, a price change in one affects the demand for the other in the opposite direction (e.g., lower car price, higher petrol demand).

 

Question 14. What do you understand by substitute goods?
Answer: Substitute goods are two products that can be used interchangeably, meaning one can be used as an alternative to the other. For example, tea and coffee are substitutes.
In simple words: Substitute goods are products you can use instead of each other.

🎯 Exam Tip: If the price of a substitute good increases, the demand for the original good will likely increase, as consumers switch to the relatively cheaper option.

 

Question 15. Mention any one determinant of demand for a commodity other than its price.
Answer: One determinant of demand for a product, other than its price, is consumer expectations. If people expect prices to change, it affects their current buying decisions.
In simple words: What people expect to happen with future prices can change how much they buy now.

🎯 Exam Tip: Determinants of demand (non-price factors) cause the entire demand curve to shift, unlike price changes which cause movement along the curve.

 

Question 16. If the quantity demanded of commodity X decreases as the household income increases, what type of good is X?
Answer: If the quantity demanded of product X decreases when household income increases, then product X is an inferior good. This means people buy less of it as they get richer.
In simple words: If people buy less of product X when they earn more money, then X is an inferior good.

🎯 Exam Tip: Inferior goods have a negative income elasticity of demand, meaning demand falls as income rises, indicating consumers opt for higher-quality alternatives.

 

Question 17. If the demand for good Y increases as price of another good X rises, how are the two goods related?
Answer: If the demand for good Y increases when the price of another good X rises, then X and Y are substitute goods. Consumers switch from the more expensive good X to its cheaper alternative, good Y.
In simple words: If people buy more of Y when X gets more expensive, then X and Y are substitutes.

🎯 Exam Tip: The demand for substitute goods moves in the same direction as the price of the other good. A price increase in one leads to an increase in demand for the substitute.

 

Question 18. What happens to the demand for a substitute good of a commodity when the price of the commodity falls/rises?
Answer: If the price of one product falls, the demand for its substitute product decreases because consumers will prefer the cheaper original product. Conversely, if the price of one product rises, the demand for its substitute product increases as consumers switch to the relatively cheaper substitute.
In simple words: If a product gets cheaper, people buy less of its substitute. If a product gets more expensive, people buy more of its substitute.

🎯 Exam Tip: Remember the direct relationship: an increase in the price of a good leads to an increase in the demand for its substitutes, and vice versa.

 

Question 19. Why does the demand for coffee increase when the price of tea increases?
Answer: The demand for coffee increases when the price of tea increases because tea and coffee are complementary goods. No, actually, they are substitute goods. As the price of tea rises, consumers find it more expensive and tend to switch to coffee, which is a relatively cheaper alternative to satisfy a similar need. This causes the demand for coffee to increase.
In simple words: Since tea and coffee are often used instead of each other, if tea gets more expensive, people will buy more coffee instead.

🎯 Exam Tip: Clearly identify if goods are substitutes or complements to correctly predict how a price change in one will affect the demand for the other.

 

Question 21. What does movement on the same demand curve show?
Answer: Movement along a demand curve shows a change in the quantity demanded of a product due to a change in its own price. It means people buy more or less only because the price of that specific item has changed.
In simple words: Moving along the demand curve means the amount people buy changes only because the item's price changed.

🎯 Exam Tip: Distinguish between a "movement along" (caused by price changes) and a "shift of" (caused by non-price factors) the demand curve.

 

Question 22. What does the shifting of a demand curve show?
Answer: A shift in a demand curve shows a change in demand due to factors other than the product's own price. These factors can include changes in income, prices of other goods, consumer tastes, or expectations. It means people want to buy a different amount at every price.
In simple words: When the whole demand curve moves, it means people want to buy more or less of an item because of things like their income or trends, not just its price.

🎯 Exam Tip: A shift in the demand curve means a new relationship between price and quantity, indicating a change in overall demand, not just quantity demanded.

 

Question 23. If the demand of CNG increases as price of petrol increases, how are these two goods related?
Answer: If the demand for CNG increases when the price of petrol increases, these two goods are substitute goods. This is because consumers switch from the more expensive petrol to the cheaper alternative, CNG.
In simple words: CNG and petrol are substitutes, so if petrol gets more expensive, people buy more CNG.

🎯 Exam Tip: Identify substitute goods by observing if a price increase in one leads to an increased demand for the other, as consumers look for cheaper alternatives.

 

Question 24. How is the demand for a complementary good affected by the increase in the price of its related good?
Answer: The demand for a complementary good decreases if the price of its related good increases. For example, if the price of cars rises, the demand for petrol (a complementary good) will decrease.
In simple words: If one item that you use with another gets more expensive, you will buy less of both items.

🎯 Exam Tip: Remember the inverse relationship for complementary goods: an increase in the price of one leads to a decrease in the demand for the other.

 

Question 25. Define market demand.
Answer: Market demand is the total amount of a product that all individual buyers in a market are willing and able to purchase at a given price and time period. It is the sum of all individual demands.
In simple words: Market demand is the total amount of a product that everyone in a market wants to buy.

🎯 Exam Tip: Market demand is obtained by horizontally summing individual demand curves, reflecting the total quantity demanded by all consumers at each price point.

 

Question 28. When is a good called a 'normal good'?
Answer: A good is called a 'normal good' when its demand increases as the buyer's income rises, showing a positive relationship between income and demand. For example, branded clothes are often normal goods.
In simple words: A normal good is something people buy more of when they have more money.

🎯 Exam Tip: Normal goods have a positive income elasticity of demand, meaning an increase in income leads to an increase in their demand.

 

Question 29. When is a good called a 'inferior good'?
Answer: A good is called an 'inferior good' when its demand decreases as the consumer's income increases. People buy less of these goods as they get richer, often switching to higher-quality alternatives. Basic grains are sometimes considered inferior goods.
In simple words: An inferior good is something people buy less of when they earn more money.

🎯 Exam Tip: Inferior goods have a negative income elasticity of demand. Consumers typically substitute these for better quality goods as their income improves.

 

RBSE Class 12 Economics Chapter 3 Short Answer Type Questions (SA-I)

 

Question 1. How many elements of demand are there for a commodity?
Answer: There are three main elements that make up demand for a product:
1. Desire for the product.
2. Having the money to buy that product.
3. Being ready and willing to spend that money.
In simple words: For something to be "demanded", you must want it, have enough money for it, and be willing to spend that money.

🎯 Exam Tip: Remember that mere desire is not demand; it must be backed by both ability and willingness to pay.

 

Question 2. What are the different uses of the commodity?
Answer: Products can have many different uses. If a product's price increases, people tend to use it only for its most important purposes, which causes its demand to decrease. However, if the price is reduced, people will use it for more things, leading to an increase in demand. For instance, electricity might be used more widely for cooking or heating if its price drops.
In simple words: If an item has many uses, its demand goes up if it gets cheaper, as people use it for more things. If it gets expensive, they use it only for important tasks, so demand falls.

🎯 Exam Tip: Goods with multiple uses show varying demand sensitivity to price changes. A price drop unlocks less essential uses, boosting overall demand.

 

Question 4. What do you understand by assumption of the law of demand?
Answer: The assumptions of the law of demand refer to all other factors that affect demand, besides the product's price. These factors, such as consumer income, tastes, and prices of related goods, are assumed to remain constant when studying the effect of price changes on demand. This helps to isolate the relationship clearly.
In simple words: Assumptions of the law of demand mean that when we study how price affects how much people buy, we pretend that everything else that could affect buying habits stays the same.

🎯 Exam Tip: The "ceteris paribus" (all other things being equal) assumption is crucial in economics for isolating the impact of one variable on another.

 

Question 5. Why are goods demanded?
Answer: Goods and services are demanded because they have the ability to satisfy our desires and needs. This ability to satisfy human wants is called 'Utility'. Therefore, goods are wanted because they possess utility.
In simple words: People want goods and services because these things are useful and can make them happy or fulfill a need.

🎯 Exam Tip: The core reason for demand is the inherent utility or satisfaction that a good or service provides to consumers.

 

Question 6. How do we distinguish between related goods and unrelated goods?
Answer: Goods are considered related if a change in the price of one affects the demand for the other. For example, if coffee's price rises, tea's demand might increase, making them related (substitutes). Unrelated goods are those whose demand is not affected by price changes in other goods; for instance, the demand for shoes is independent of sugar prices.
In simple words: Related goods influence each other's demand when prices change. Unrelated goods have no such connection.

🎯 Exam Tip: Related goods can be either substitutes (if demand for one rises with the other's price) or complements (if demand for one falls with the other's price).

 

Question 7. How can we say effect of income is positive or negative?
Answer: The effect of income is positive when an increase in income leads to an increase in demand, which is typical for normal goods. Conversely, the effect of income is negative when an increase in income causes a decrease in demand, characteristic of inferior goods.
In simple words: When income goes up, if you buy more, it's a positive income effect. If you buy less, it's a negative income effect.

🎯 Exam Tip: The income effect helps classify goods: positive for normal goods, negative for inferior goods. This relationship is crucial for understanding consumer behavior.

 

Question 9. What do you understand by quantity demanded?
Answer: Quantity demanded refers to the specific amount of a product that a consumer is willing and able to buy at a particular price at a certain point in time. It is a single point on the demand curve.
In simple words: Quantity demanded is the exact number of items someone wants to buy at a certain price right now.

🎯 Exam Tip: Differentiate between "demand" (the entire curve) and "quantity demanded" (a specific point on the curve, influenced only by price).

 

Question 10. How does the structure of population affect the demand?
Answer: The age structure of the population significantly affects demand. For example, countries with many young people will have higher demand for modern textiles and youth-oriented products. Conversely, an older population would increase demand for traditional items and healthcare services.
In simple words: What kinds of people live in a country, like if there are more young people or old people, changes what products are most wanted.

🎯 Exam Tip: Population demographics (age, gender, income distribution) are significant non-price determinants that shift the market demand curve for various goods.

 

Question 11. What are Giffen goods?
Answer: Giffen goods are a special type of inferior good where demand increases as the price rises, defying the law of demand. Sir R. Giffen first observed this in 19th-century Britain, where low-wage workers bought more bread when its price increased because they could no longer afford expensive alternatives like meat, even though bread itself was more costly. They were forced to consume more of the basic staple.
In simple words: Giffen goods are cheap, basic items that people buy more of even when their price goes up. This happens because they are very poor and cannot afford other food.

🎯 Exam Tip: Giffen goods are characterized by a strong negative income effect that outweighs the substitution effect, leading to an upward-sloping demand curve.

 

Question 2. What are Veblen goods?
Answer: Veblen goods are luxury items, like diamonds, bought primarily for their 'snob appeal' or to show off wealth, rather than their practical use. Their demand increases as their price rises, because a higher price makes them more exclusive and desirable. This is known as 'conspicuous consumption'. For example, if fish becomes very expensive, some people might buy more to signal their wealth.
In simple words: Veblen goods are expensive luxury items that people buy more of when their price goes up, mostly to show off their wealth and status.

🎯 Exam Tip: Veblen goods are another exception to the law of demand, where a higher price enhances their desirability due to their status symbol nature.

 

Question 1. What is meant by 'Ceteris Paribus'? What factors are covered under Ceteris Paribus condition in relation to law of demand?
Answer: 'Ceteris Paribus' is a Latin phrase meaning "all other things remaining constant" or "nothing else changes." In economics, it's an assumption used to isolate the effect of a single factor. For the law of demand, it means we only look at how price changes affect quantity demanded, while assuming these factors stay the same:
1. Tastes and preferences of consumers.
2. Income of the consumer.
3. Prices of related goods.
4. Expectations about future prices.
5. Number of consumers in the market.
6. Government regulations.
In simple words: 'Ceteris Paribus' means we only look at one change at a time, keeping everything else the same. For demand, this means we only study price changes, not changes in income or tastes.

🎯 Exam Tip: Clearly list the key determinants of demand that are held constant under the ceteris paribus assumption when explaining the law of demand.

 

Question 2. How will you explain the law of demand with the help of income effect?
Answer: The law of demand can be explained using the income effect: when the price of a product falls, a consumer's real income (or purchasing power) effectively increases. This means they can afford to buy more of the product with the same amount of money. For normal goods, this higher real income leads to an increased demand for the product, causing the demand curve to move upwards. Conversely, a price rise reduces real income, decreasing demand.
In simple words: When something gets cheaper, you feel like you have more money (income effect). So, you buy more of that item, which is part of why demand goes up when prices fall.

🎯 Exam Tip: Explain that the income effect means a change in price alters consumers' real purchasing power, influencing their ability and willingness to buy goods.

 

Question 3. How will you explain the law of demand with the help of substitution effect of a change in price of a commodity?
Answer: The substitution effect explains the law of demand by showing that when the price of a product falls, it becomes relatively cheaper compared to its substitutes. Consumers then tend to buy more of this cheaper product and less of its more expensive substitutes. For instance, if coffee's price falls while tea's price stays the same, consumers might buy more coffee instead of tea, leading to a decreased demand for tea and increased demand for coffee. This shift contributes to the inverse relationship between price and quantity demanded.
In simple words: When an item gets cheaper, people buy more of it because it's now a better deal than other similar items. They "substitute" the cheaper one for the more expensive ones.

🎯 Exam Tip: Highlight that the substitution effect drives consumers to switch to a product that has become relatively cheaper, leading to an increase in its quantity demanded.

 

Question 5. State the law of demand and explain its assumptions.
Answer: The Law of Demand states that, if all other factors remain constant (ceteris paribus), the quantity demanded of a product will increase as its price falls, and decrease as its price rises. This shows an inverse relationship between price and quantity demanded.
Assumptions of the law of demand are:
1. Income level of consumers should remain stable.
2. Tastes and preferences of consumers should not change.
3. Prices of related goods (substitutes and complements) should be constant.
4. No new substitute products should enter the market.
5. Consumer expectations about future prices or income should not change.
In simple words: The law of demand says that people buy more when prices are low and less when prices are high, but only if nothing else affecting their buying habits changes.

🎯 Exam Tip: Clearly state the inverse relationship for the law of demand and ensure you list the core "ceteris paribus" assumptions that make this law hold true.

 

Question 7. Define inferior goods with an example.
Answer: Inferior goods are products whose demand decreases as the consumer's income increases. These are usually cheaper alternatives that people consume less of when they can afford better options. For example, off-brand grocery items like basic grains or rice are often considered inferior goods. When income rises, consumers tend to switch to branded or higher-quality alternatives.
In simple words: Inferior goods are cheap items that people stop buying, or buy less of, once they have more money, because they can afford better quality items.

🎯 Exam Tip: When defining inferior goods, always mention the negative relationship with income and provide a clear, relatable example.

 

Question 8. Define normal goods with example.
Answer: Normal goods are products whose demand increases as the consumer's income rises. There is a positive relationship between income and demand for these goods, known as the Positive Income Effect. Examples include LCD and Plasma TVs, more expensive cars, branded clothing, and diamonds. As people earn more, they buy more of these items.
In simple words: Normal goods are items people buy more of when their income goes up. Things like good clothes or electronics are examples.

🎯 Exam Tip: When defining normal goods, emphasize the positive relationship with income and provide examples of items typically considered non-essential but desired with higher income.

 

Question 9. Distinguish between inferior goods and normal goods.
Answer: Normal goods are those whose demand increases as consumer income rises, showing a positive relationship between income and demand (Positive Income Effect). Inferior goods, on the other hand, are those whose demand decreases as consumer income increases, showing a negative relationship. An inferior good is essentially the opposite of a normal good; consumers demand less of it when they have higher real income.
In simple words: Normal goods are bought more when you have more money, while inferior goods are bought less when you have more money.

🎯 Exam Tip: The key distinction between normal and inferior goods lies in how their demand responds to changes in consumer income.

 

Question 10. Define increase in demand with the help of a diagram.
Answer: Increase in demand occurs when consumers decide to buy more of a product at every given price. This is represented by a rightward shift of the entire demand curve, from \( D_1 \) to \( D_2 \). This shift is caused by factors other than the product's own price, such as an increase in consumer income or a change in tastes.

The table and diagram show that when the price is Rs 10 per unit, 20 units are initially demanded. However, even at the constant price of Rs 10, consumers now demand 30 units. This increase is due to factors other than price, causing the entire demand curve to shift from \( D_1 \) to \( D_2 \). The consumer moves from point A on \( D_1 \) to point B on \( D_2 \).
In simple words: When people want to buy more of something even if its price hasn't changed, that's an increase in demand. On a graph, the whole demand line moves to the right.

🎯 Exam Tip: An increase in demand (rightward shift) is a change in overall buying desire, not just a response to a price change for the same product.

 

Question 11. What are the important causes of increase in demand?
Answer: Important causes that lead to an increase in demand are:
1. When the income of the consumer increases.
2. When the price of substitute goods increases.
3. When the price of complementary goods falls.
4. When consumer tastes shift in favor of the goods due to changes in fashion or climate.
5. When the price of the product is expected to increase in the near future.
6. An increase in the number of consumers.
7. When the consumer's income is expected to increase in the future.
In simple words: Demand goes up when people earn more, when other similar products get more expensive, when things that go with the product get cheaper, or when more people want to buy it.

🎯 Exam Tip: For each factor causing an increase in demand, be ready to briefly explain *why* it leads to a higher quantity demanded at every price level.

 

Question 13. Describe substitute effects of the change in price of the commodity.
Answer: The substitution effect happens when the price of a good falls, making it seem cheaper compared to other goods. This encourages consumers to buy more of the now cheaper good and less of others, even if their actual income hasn't changed. This increase in demand for the cheaper item is what we call the substitution effect.
In simple words: When something becomes cheaper, people buy more of it instead of other things that now seem more expensive. This change in choice is the substitution effect.

🎯 Exam Tip: Clearly define what the substitution effect is and how relative prices influence consumer choices, leading to a shift in consumption patterns.

 

Question 14. What do you understand by individual demand schedule?
Answer: An individual demand schedule is a table that shows the different amounts of a specific item a single consumer is willing and able to buy at various prices over a given period. It highlights the quantities a person would purchase at each price point at a particular time.
In simple words: It's a list showing how much of one thing a single person would buy at different prices.

🎯 Exam Tip: Remember that an individual demand schedule focuses on one consumer's buying habits at different prices, forming the basis for an individual demand curve.

 

Question 15. What do you understand by market demand schedule?
Answer: A market demand schedule is a table that shows the total quantity of a good that all consumers in a market are willing and able to buy at various prices over a specific period. It is essentially the sum of all individual demand schedules in the market. As the price of a good increases, its market demand usually decreases.
In simple words: It's a table that shows the total amount of a product everyone in the market would buy at different prices.

🎯 Exam Tip: Distinguish market demand from individual demand by emphasizing that market demand aggregates the choices of all consumers.

 

Question 16. What are the main characteristics of law of demand?
Answer: The main characteristics of the Law of Demand are: 1. It states an inverse relationship between price and quantity demanded. 2. It assumes that other factors (like income, tastes, related goods' prices) remain constant. 3. It is a qualitative statement, explaining the direction of change, not the exact amount.
In simple words: The law of demand says that if the price goes down, people buy more, and if the price goes up, people buy less, as long as everything else stays the same.

🎯 Exam Tip: Mention the inverse relationship and the 'ceteris paribus' (other things remaining constant) assumption to fully describe the law of demand.

 

Question 17. State any three causes of a rightward shift of demand curve of a commodity.
Answer: Three causes of a rightward shift of the demand curve for a commodity are: (i) Income Effect: When the price of a commodity falls, the consumer's real income (purchasing power) increases. This allows them to buy more of the commodity, leading to increased demand. (ii) Substitution Effect: If the price of a commodity falls while the prices of its substitutes remain constant, the commodity becomes relatively cheaper. Consumers will then buy more of this cheaper good instead of its substitutes, increasing its demand. (iii) Other Factors Remain the Same: The law of demand assumes that factors other than price (like consumer tastes, income, or prices of related goods) stay constant. If these other factors change in a way that increases demand, the entire demand curve shifts to the right.
In simple words: A demand curve shifts right when people buy more of a product, not because its price changed, but because they have more money, other similar products became expensive, or their liking for it grew.

🎯 Exam Tip: When discussing shifts in the demand curve, always relate them to changes in non-price determinants, contrasting with movements along the curve caused by price changes.

 

Question 18. State the factors causing decrease in demand.
Answer: Main factors causing decrease in demand are: 1. **Decrease in Consumer's Income:** If consumers earn less money, they might buy fewer goods, especially normal goods. 2. **Negative Change in Tastes/Preferences:** If a product goes out of fashion or people's liking for it decreases, demand will fall. 3. **Increase in Price of Complementary Goods:** If the price of a good used with another (like petrol for cars) goes up, the demand for the other good (cars) might decrease. 4. **Decrease in Price of Substitute Goods:** If a competing product becomes cheaper, consumers might switch to it, causing demand for the original product to fall. 5. **Expectation of Future Price Fall:** If consumers expect a product's price to drop in the future, they might delay buying it now, reducing current demand. 6. **Decrease in Population Size:** Fewer potential buyers in the market lead to a general decrease in demand.
In simple words: Demand goes down if people have less money, don't like the product anymore, or if related products become more expensive or cheaper alternatives appear.

🎯 Exam Tip: Remember that a decrease in demand causes a leftward shift of the entire demand curve, meaning less is bought at every price.

 

Question 19. What is meant by 'Ceteris Paribus' assumptions?
Answer: 'Ceteris Paribus' is a Latin phrase meaning "all other things being equal" or "nothing else changes." In economics, it's an important assumption used in the law of demand to isolate the effect of a change in one factor (like price) on demand, while assuming all other factors remain constant. The factors covered under 'Ceteris Paribus' for the law of demand are: 1. Consumer's income is fixed and stable. 2. Tastes and preferences of the consumer remain constant. 3. The given price change for the commodity is a normal one, not imaginary. 4. Prices of other goods like substitutes and complementary goods remain constant. 5. There is no change in how income and wealth are shared in the community. 6. The size of the population is unchanged. 7. The level of taxation and other government financial measures do not change significantly.
In simple words: 'Ceteris Paribus' means we pretend only one thing changes at a time, so we can see its clear effect on demand, keeping everything else the same.

🎯 Exam Tip: Emphasize that 'Ceteris Paribus' is crucial for establishing clear cause-and-effect relationships in economic laws by isolating variables.

 

Question 21. How is the market demand curve derived from the individual demand curves?
Answer: The market demand curve is derived from individual demand curves by adding up the quantities demanded by all individual purchasers at each possible price. If you have the demand schedules for each person in the market, you simply sum their quantities demanded at every price point to get the total market demand. Graphically, this means horizontally summing the individual demand curves.
In simple words: To get the market demand curve, you just add up how much every single person wants to buy at each different price.

🎯 Exam Tip: Remember that market demand is the horizontal summation of individual demands, meaning you add the quantities across for each price level.

 

Question 22. Explain the determinants of the market demand curve.
Answer: The determinants of the market demand curve are factors that can cause the entire curve to shift, indicating a change in total demand at every price level. These include: (i) **Population:** As the population grows, the number of potential buyers increases, which usually leads to a rise in demand for goods. Conversely, a population decline reduces demand. The age and gender structure of the population also influence demand for specific goods (e.g., more women means higher demand for women's products). (ii) **Income Distribution:** The way income and wealth are distributed among people in a community affects overall demand. If income is more evenly distributed, demand for basic goods might be higher, whereas if it's concentrated among a few, luxury good demand might be more prominent.
In simple words: Market demand depends on things like how many people are in a country, how rich they are, and how that wealth is shared among them.

🎯 Exam Tip: When discussing determinants of market demand, consider factors beyond individual consumer choices, focusing on broader societal and economic conditions.

 

Question 23. From the following table, prepare demand schedule for household B, given demand schedule of household A, C and market demand schedule.

Answer: To find the demand for Household B, we subtract the demands of Household A and Household C from the total Market Demand at each price level. This is because Market Demand is the sum of all individual demands (Household A + Household B + Household C).

In simple words: We find Household B's demand by taking the total market demand and subtracting what Household A and Household C wanted at each price.

🎯 Exam Tip: Remember that market demand is the sum of individual demands. When given market demand and some individual demands, you can find the missing individual demand by simple subtraction.

 

Question 25. What is cross demand?
Answer: Cross demand refers to the change in demand for one good when the price of a different, but related, good changes. These related goods can be either substitutes (used in place of each other) or complementary goods (used together). For example, if the price of coffee goes up, the demand for tea (a substitute) might increase.
In simple words: It's how much the demand for one product changes when the price of another related product changes.

🎯 Exam Tip: Clearly define cross demand and provide examples of how it works for both substitute and complementary goods.

 

Question 26. What is income demand?
Answer: Income demand refers to the different quantities of a good that consumers are willing to purchase at various levels of their income, assuming other factors like the good's own price and prices of related goods remain constant. It shows the relationship between a consumer's income and the amount of a good they demand. Generally, demand for normal goods increases with higher income, while demand for inferior goods decreases.
In simple words: Income demand shows how much of a product people buy as their income changes, keeping all other prices the same.

🎯 Exam Tip: Remember that income demand helps understand if a good is normal (demand rises with income) or inferior (demand falls with income).

 

Question 27. What are the reasons of shift in demand curve? Or Distinguish between decrease in demand or left shift curve and increase in demand or right shift curve.
Answer: A shift in the demand curve means that the entire demand curve moves either to the right (increase in demand) or to the left (decrease in demand). This happens due to changes in factors other than the commodity's own price. The main reasons for a change in demand are summarized in the following table:

In simple words: A demand curve shifts when something other than the product's price changes. It shifts right if people want more (e.g., income rises for normal goods), and left if they want less (e.g., income falls for normal goods).

🎯 Exam Tip: Clearly differentiate between a "movement along" a demand curve (due to price changes) and a "shift" of the demand curve (due to non-price factors). Provide examples for each.

 

RBSE Class 12 Economics Chapter 3 Long Answer Type Questions

 

Question 1. Briefly describe market demand and state the factors that affect market demand.
Answer: Market demand for a product is the total quantity that all individual consumers are willing and able to buy at a specific price during a certain period. It is simply the sum of all individual demands in the market at various prices. Let's consider an example with three consumers (A, B, and C) for Pepsi. Their individual weekly demands at different prices are shown in the table below. The last column shows the total market demand, which is calculated by adding the individual demands of A, B, and C at each price.

The last column of the table shows the total weekly market demand for Pepsi. The market demand curve can be created by plotting this data.

Some important factors that affect market demand are: (i) **Price of Substitutes and Complementary Goods**: The demand for a product is influenced by the prices of other related goods. - **Substitutes**: If the price of a substitute good (like Coke for Pepsi) increases, consumers will switch to the relatively cheaper good (Pepsi), increasing its demand. If the substitute's price falls, Pepsi's demand will decrease. - **Complements**: If the price of a complementary good (like cinema tickets for popcorn) falls, the demand for popcorn will increase because people will consume more of both. If the price of the complement rises, the demand for popcorn will decrease. (ii) **Consumer's Income and Engle Curves**: A consumer's income is a major factor in demand. People with higher disposable incomes usually spend more on goods and services. The relationship between income and demand helps classify goods: - **Essential Consumer Goods**: These are basic necessities (food, grains, clothes) that most people consume, and demand doesn't change much with income. - **Inferior Goods**: Demand for these goods decreases as income rises because consumers switch to better quality alternatives. - **Normal Goods**: Demand for these goods increases as consumers' income rises. (iii) **Expected Utility at Equilibrium**: Consumers aim to maximize their total satisfaction. They allocate their budget so that the satisfaction per unit of money spent is equal across all goods. (iv) **Consumer's Expectations**: Expectations about future prices or income can influence current demand. For instance, if they expect prices to rise soon, they might buy more now. If they expect prices to fall, they might delay purchases. (v) **Demonstration Effect**: When new products or models appear, wealthy individuals often buy them first. Others might follow, not out of genuine need, but to imitate or show status (bandwagon effect), which also boosts demand. (vi) **Consumer Credit Facility**: Easy access to credit (loans, installment plans) can encourage consumers to make purchases they might otherwise delay or forgo. This is especially true for expensive durable goods. (vii) **Population of the Country**: The total demand for a product depends on the size and structure of the population. A larger population generally means higher demand for a wide range of products. The age and income structure of the population also play a role.
In simple words: Market demand is the total of what everyone wants to buy. It's affected by prices of other related items, how much money people have, what they expect prices to be in the future, if others are buying it, how easy it is to get credit, and how many people there are.

🎯 Exam Tip: When describing market demand, always start with its definition as the sum of individual demands. Then, systematically explain each determinant, providing clear examples to illustrate its impact on the demand curve.

 

Question 2. Distinguish between individual demand and market demand.
Answer:(i) **Individual Demand**: This refers to the quantity of a product that a single consumer is willing and able to buy at a specific price at a given time. An individual demand schedule lists these quantities at different prices, and an individual demand curve is its graphical representation, usually sloping downwards from left to right. Example of an Individual Demand Schedule:

The diagram below shows a typical individual demand curve:
(ii) **Market Demand**: This is the total quantity of a product that all consumers in a market are willing and able to buy at various possible prices during a specific period. The market demand schedule aggregates the individual demands, and the market demand curve is its graphical representation. The process involves summing up the demand of each individual at every price point. An example of a market demand schedule:The market demand can also be shown graphically. The graph of demand is called the Demand Curve. It represents the maximum amount of goods all consumers will buy at different prices. The following diagram shows the market demand curve:
In simple words: Individual demand is what one person wants to buy, while market demand is what all people together want to buy. You add up everyone's individual demands to get the market demand.

🎯 Exam Tip: When distinguishing between individual and market demand, use examples and clearly explain how individual demands sum up to form market demand, both in tables and graphs.

 

Question 3. Distinguish between extension of demand and increase in demand with the help of diagram.
Answer: It's important to understand the difference between an "extension of demand" and an "increase in demand" because they refer to different changes in consumer behavior.

**Diagram for Extension of Demand (Movement along a curve):**

**Diagram for Increase in Demand (Shift of the curve):**
In simple words: "Extension of demand" means buying more because the price dropped (movement along the same curve). "Increase in demand" means buying more even if the price is the same, due to other reasons like more income (the whole curve shifts right).

🎯 Exam Tip: Clearly define and illustrate both concepts. For extension/contraction, show movement along a single curve. For increase/decrease, show a shift of the entire curve, emphasizing the difference in underlying causes.

 

Question 4. Explain the factors which determine demand for a commodity.
Answer: The demand for any product is influenced by several key factors. Understanding these helps explain why consumers buy more or less of something. The main factors determining demand for a commodity are: (i) **Tastes and Preferences**: What consumers like and dislike (their tastes and preferences) significantly impacts demand. Products that are fashionable or preferred will have higher demand. For example, if color televisions are preferred, demand for black and white TVs will decrease. (ii) **Price of the Commodity**: There is an inverse relationship between a commodity's own price and its quantity demanded. If the price rises, demand typically falls, and vice-versa. This occurs due to the income and substitution effects. (iii) **Price of Related Goods**: Demand is also affected by the prices of goods related to the commodity. - **Complementary Goods**: These are goods used together (e.g., tea and sugar, cars and petrol). If the price of one complementary good falls, the demand for the other tends to rise (e.g., cheaper cars lead to more petrol demand). - **Substitute Goods**: These are goods that can be used in place of one another (e.g., tea and coffee). If the price of a substitute good falls, demand for the original commodity will decrease (e.g., cheaper coffee reduces demand for tea). (iv) **Income of the Consumer**: Generally, as a consumer's income increases, their demand for most goods (normal goods) also increases. However, for inferior goods, demand might decrease as income rises because consumers can afford better alternatives. (v) **Consumer's Expectations**: Expectations about future prices or income can influence current demand. If consumers expect prices to rise in the future, they might buy more now. If they expect income to increase, they might plan larger purchases. (vi) **Demonstration Effect**: People sometimes buy goods not because they need them, but because others have them or to show off. This "bandwagon effect" can increase demand for certain fashionable or luxury items. (vii) **Consumer Credit Facility**: Easy access to credit, such as installment plans or loans, can encourage consumers to make purchases they might otherwise delay or forgo. This is especially true for expensive durable goods. (viii) **Population of the Country**: The size of the population directly affects overall market demand. A larger population usually means a greater demand for a wide range of products. The age and income structure of the population also play a role.
In simple words: Many things make people want to buy more or less of a product, such as what they like, how much money they have, how much the product costs, how much other similar products cost, and what they expect to happen with prices in the future.

🎯 Exam Tip: Systematically list and explain each determinant of demand. Provide clear, simple examples for each factor to demonstrate how it influences consumer buying decisions.