Passage Based Questions: Theory of Consumer Behaviour
Passage - 1
Direction: Read the following Passage and Answer the Questions.
A consumer usually decides his demand for a commodity on the basis of utility (or satisfaction) that he derives from it. What is utility? Utility of a commodity is its want-satisfying capacity. The more the need of a commodity or the stronger the desire to have it, the greater is the utility derived from the commodity. Utility is subjective. Different individuals can get different levels of utility from the same commodity.
Q1: What is utility in the context of economics, and how is it defined?
Ans:
- Utility in economics refers to the want-satisfying capacity of a commodity; it is the satisfaction a consumer obtains from consuming a good or service.
- It represents the benefit or pleasure that an individual derives from using a particular item and is used to explain consumer choices.
- Utility is a way to measure how well a product or service fulfils a person's needs or desires, keeping in mind that it is not directly observable but inferred from choices.
Q2: How does the strength of desire or need for a commodity relate to its utility?
Ans:
- There is a direct relationship: the stronger a person's desire or the greater the need for a commodity, the higher the utility derived from it.
- If a commodity is more essential or highly valued by an individual, it yields greater satisfaction compared with less desired goods.
- Thus, items that better satisfy important needs produce greater utility for the consumer.
Q3: Why is utility considered subjective, and how does this subjectivity manifest in economics?
Ans:
- Utility is subjective because different individuals have different tastes, preferences, income levels and situations, so the same good may provide different satisfaction to different people.
- This subjectivity shows up in market behaviour: people choose different bundles of goods even when faced with the same prices, reflecting individual valuations of utility.
- For this reason, economists treat utility as a personal measure that explains individual choices rather than an objective quantity common to all.
Passage - 2
Direction: Read the following Passage and Answer the Questions.
The negative slope of the demand curve can also be explained in terms of the two effects namely, substitution effect and income effect that come into play when price of a commodity changes. When bananas become cheaper, the consumer maximises his utility by substituting bananas for mangoes in order to derive the same level of satisfaction of a price change, resulting in an increase in demand for bananas.Moreover, as price of bananas drops, consumer's purchasing power increases, which further increases demand for bananas (and mangoes). This is the income effect of a price change, resulting in further increase in demand for bananas. Law of Demand: Law of Demand states that other things being equal, there is a negative relation between demand for a commodity and its price. In other words, when price of the commodity increases, demand for it falls and when price of the commodity decreases, demand for it rises, other factors remaining the same.
Q1: What are the two effects that explain the negative slope of the demand curve when the price of a commodity changes?
Ans:
- The two effects are the substitution effect and the income effect.
Q2: How does the substitution effect contribute to an increase in demand for bananas when their price decreases?
Ans:
- When the price of bananas falls, consumers find bananas relatively cheaper compared with other goods (for example, mangoes) and substitute bananas for those relatively more expensive goods.
- This switch raises the quantity demanded of bananas because purchasers choose the lower-priced good while maintaining a similar level of satisfaction.
Q3: What is the income effect, and how does it influence the demand for bananas when their price decreases?
Ans:
- The income effect arises because a fall in the price of bananas increases the consumer's real purchasing power, allowing them to buy more with the same nominal income.
- As a result, consumers may purchase additional bananas (and possibly more of other goods), which further raises the demand for bananas beyond the substitution effect.
Passage - 3
Direction: Read the following Passage and Answer the Questions.
The demand function is a relation between the consumer's demand for a good and its price when other things are given. Instead of studying the relation between the demand for a good and its price, we can also study the relation between the consumer's demand for the good and the income of the consumer. The quantity of a good that the consumer demands can increase or decrease with the rise in income depending on the nature of the good. For most goods, the quantity that a consumer chooses, increases as the consumer's income increases and decreases as the consumer's income decreases. Such goods are called normal goods.
Q1: What does the demand function describe, and what are its key variables?
Ans:
- The demand function describes the relationship between the quantity demanded of a good and its price, holding other factors constant.
- The key variables are the price of the good and the quantity demanded, though other factors (income, tastes) are held fixed when using the basic demand function.
Q2: How is the concept of normal goods defined in relation to changes in consumer income?
Ans:
- Normal goods are goods for which the quantity demanded rises when the consumer's income increases and falls when income decreases.
- Such goods exhibit a positive income elasticity of demand, meaning consumers buy more of them as their purchasing power grows.
Q3: Can you explain the alternative approach to studying consumer demand mentioned in the passage?
Ans:
- Instead of relating demand only to price, one can study how the quantity demanded changes with the consumer's income.
- This income-based approach shows how changes in income affect demand and helps distinguish between normal and inferior goods.
Passage - 4
Direction: Read the following Passage and Answer the Questions.
The quantity of a good that the consumer chooses can increase or decrease with the rise in the price of a related good depending on whether the two goods are substitutes or complementary to each other. Goods which are consumed together are called complementary goods. Examples of goods which are complement to each other include tea and sugar, shoes and socks, pen and ink, etc. Since tea and sugar are used together, an increase in the price of sugar is likely to decrease the demand for tea and a decrease in the price of sugar is likely to increase the demand for tea. Similar is the case with other complements. In general, the demand for a good moves in the opposite direction of the price of its complementary goods.
Q1: What factors determine whether the quantity of a good a consumer chooses will increase or decrease with the rise in the price of a related good?
Ans:
- The effect depends on the relationship between the two goods: whether they are substitutes (used in place of each other) or complements (used together).
Q2: What are complementary goods, and can you provide examples of such goods mentioned in the passage?
Ans:
- Complementary goods are goods that are consumed together so that the use of one increases the usefulness of the other.
- Examples given include tea and sugar, shoes and socks, and pen and ink.
Q3: How does the price change of complementary goods impact the demand for the main good, and what is the general relationship between the price of complementary goods and the demand for the main good?
Ans:
- If the price of a complementary good rises, the demand for the related main good usually falls because joint consumption becomes more expensive.
- Conversely, a fall in the price of a complement tends to raise the demand for the main good; in general, demand for a good moves in the opposite direction to the price of its complements.
Passage - 5
Direction: Read the following Passage and Answer the Questions.
The demand function is a relation between the amount of the good and its price when other things remain unchanged. The demand curve is a graphical representation of the demand function. At higher prices, the demand is less, and at lower prices, the demand is more. Thus, any change in the price leads to movements along the demand curve. On the other hand, changes in any of the other things lead to a shift in the demand curve.
Q1: What does the demand function represent, and how is it related to the demand curve?
Ans:
- The demand function represents the relationship between the quantity demanded of a good and its price, holding other factors constant.
- The demand curve is the graphical representation of this function, showing how quantity demanded changes as price changes.
Q2: How do changes in price impact the demand curve, and what kind of movement occurs along the curve?
Ans:
- Changes in price cause a movement along the demand curve: a price rise reduces quantity demanded and a price fall increases quantity demanded.
- Such movements reflect changes in the quantity demanded at different prices while other factors remain unchanged.
Q3: What causes a shift in the demand curve, and what are the implications of changes in factors other than price on consumer demand?
Ans:
- A change in factors other than price-such as consumer income, tastes, expectations, or the prices of related goods-causes the entire demand curve to shift.
- A rightward shift indicates that consumers are willing to buy more of the good at every price, while a leftward shift indicates they buy less at every price.
Passage - 6
Direction: Read the following Passage and Answer the Questions.
The demand for a good moves in the opposite direction of its price. But the impact of the price change is always not the same. Sometimes, the demand for a good changes considerably even for small price changes. On the other hand, there are some goods for which the demand is not affected much by price changes. Demands for some goods are very responsive to price changes while demands for certain others are not so responsive to price changes. Price elasticity of demand is a measure of the responsiveness of the demand for a good to changes in its price.
Q1: What does the direction of demand for a good in response to price changes depend on, and why is the impact not always the same?
Ans:
- The direction is generally negative-price and demand move in opposite directions-but the magnitude of the change depends on how responsive demand is to price changes (that is, on price elasticity).
- The impact differs because some goods have highly responsive demand (elastic) while others have little response to price changes (inelastic), depending on factors such as substitutes, necessity and proportion of income spent on the good.
Q2: How is price elasticity of demand defined, and what does it measure?
Ans:
- Price elasticity of demand measures the percentage change in quantity demanded resulting from a one per cent change in price.
- It quantifies how sensitive consumers are to price changes for a particular good.
Q3: What does it mean when a good has high price elasticity of demand, and what about goods with low price elasticity of demand?
Ans:
- If a good has high price elasticity, even a small change in price leads to a large change in quantity demanded; consumers are price-sensitive for such goods.
- Goods with low price elasticity show little change in quantity demanded even when price changes; these goods are price-insensitive, often because they are necessities or lack close substitutes.
Passage - 7
Direction: Read the following Passage and Answer the Questions.
When the percentage change in quantity demanded equals the percentage change in its market price, eD is estimated to be equal to one and the demand for the good is said to be Unitary-elastic at that price. Note that the demand for certain goods may be elastic, unitary elastic and inelastic at different prices. In fact, in the next section, elasticity along a linear demand curve is estimated at different prices and shown to vary at each point on a downward sloping demand curve.
Q1: What is meant by a good having unitary-elastic demand, and what condition must be met for eD to equal one?
Ans:
- Unitary-elastic demand means the percentage change in quantity demanded is exactly equal to the percentage change in price.
- Thus, eD equals one when a given percentage change in price produces an equal percentage change in quantity demanded.
Q2: Can a good have different elasticity values at various price points, and why does this occur?
Ans:
- Yes. A good can be elastic, unitary-elastic or inelastic at different price levels because elasticity depends on the relative percentage changes in price and quantity at each point along the demand curve.
- As price and quantity vary along a downward-sloping demand curve, the ratio of percentage changes also varies, producing different elasticity values at different points.
Q3: What will be demonstrated in the next section regarding elasticity along a linear demand curve, and why does it vary at different points on such a curve?
Ans:
- The next section will show how elasticity is calculated at various points on a linear demand curve and that it changes from elastic to inelastic as one moves along the curve.
- This variation occurs because the same absolute change in price or quantity represents different percentage changes at different price-quantity combinations, altering the elasticity value.
Passage - 8
Direction: Read the following Passage and Answer the Questions.
The price elasticity of demand for a good depends on the nature of the good and the availability of close substitutes of the good. Consider, for example, necessities like food. Such goods are essential for life and the demands for such goods do not change much in response to changes in their prices. Demand for food does not change much even if food prices go up. On the other hand, demand for luxuries can be very responsive to price changes. In general, demand for a necessity is likely to be price inelastic while demand for a luxury good is likely to be price elastic.
Q1: What factors influence the price elasticity of demand for a good?
Ans:
- Price elasticity of demand depends on the nature of the good (necessity or luxury) and the availability of close substitutes.
Q2: How does the demand for necessities, like food, typically respond to changes in their prices, and what is the likely elasticity in such cases?
Ans:
- Demand for necessities such as food tends to be inelastic, meaning it does not change much when prices change because these goods are essential.
- Even if prices rise, consumers reduce consumption only slightly since they still need these goods.
Q3: What characterizes the demand for luxury goods in terms of responsiveness to price changes, and what is the expected price elasticity for luxury goods?
Ans:
- Demand for luxury goods is usually more price elastic; small price increases can lead to large reductions in quantity demanded because consumers can postpone or forego such purchases.
- Luxury goods often have many substitutes or are discretionary, making demand more sensitive to price changes.
Passage - 9
Direction: Read the following Passage and Answer the Questions.
The expenditure on a good is equal to the demand for the good times its price. Often it is important to know how the expenditure on a good changes as a result of a price change. The price of a good and the demand for the good are inversely related to each other. Whether the expenditure on the good goes up or down as a result of an increase in its price depends on how responsive the demand for the good is to the price change.
Q1: How is the expenditure on a good calculated, and what does it depend on?
Ans:
- Expenditure on a good is calculated as price × quantity demanded.
- It depends both on the market price of the good and the quantity consumers purchase at that price.
Q2: What is the general relationship between the price of a good and its demand, and how does this relationship affect the expenditure on the good when the price changes?
Ans:
- Price and demand are generally inversely related: a rise in price tends to reduce quantity demanded and a fall in price tends to increase it.
- Whether total expenditure rises or falls after a price change depends on how much quantity demanded changes in response to the price change (that is, on elasticity).
Q3: How does the elasticity of demand for a good influence changes in its expenditure when its price increases?
Ans:
- If demand is inelastic, the percentage fall in quantity demanded is smaller than the percentage rise in price, so total expenditure increases when price rises.
- If demand is elastic, the percentage fall in quantity demanded is larger than the percentage rise in price, so total expenditure falls when price rises.
