Which of the following best defines the price elasticity of demand?
Focus on whether the concept is measuring a direction of change or the magnitude of a reaction.
This concept quantifies the responsiveness of buyers to price changes, moving beyond qualitative statements about direction.
This is the definition of the Law of Demand, which describes the direction of change rather than the magnitude of responsiveness.
This describes income elasticity of demand rather than price elasticity.
This describes a determinant of demand that causes a shift, while price elasticity measures movement along a specific curve.
Question 2/ 10
Based on the determinants of elasticity discussed in the text, which of these products likely has the most inelastic demand?
Consider whether the consumer views the good as an absolute necessity or an optional luxury.
Necessities with few or no close substitutes tend to have very low responsiveness to price changes.
Narrowly defined markets and luxury goods typically have more elastic demand because consumers can easily switch to alternatives.
Luxuries are often perceived as optional, leading consumers to be more sensitive to price increases.
Since there are many other vegetables that can serve as substitutes, demand for a specific vegetable is generally elastic.
Question 3/ 10
If the price of a good increases by 10% and the quantity demanded drops by 20%, the demand for that good is considered:
Compare the size of the quantity's reaction to the size of the price change.
Demand is elastic when the percentage change in quantity is greater than the percentage change in price, resulting in an elasticity value greater than 1.
Inelastic demand occurs when the quantity responds only slightly, meaning the percentage change in quantity is less than the percentage change in price.
Unit elasticity requires the percentage changes in price and quantity to be exactly equal.
Perfectly inelastic demand would show zero change in quantity regardless of the price change.
Question 4/ 10
According to the 'memory trick' provided in Chapter 5, what is a visual characteristic of an inelastic demand curve?
Think about the shape of a curve where quantity barely moves even when price changes significantly.
The text suggests this mnemonic to help students remember that steep curves represent low responsiveness (inelasticity).
Horizontal curves represent perfectly elastic demand, where even a tiny price change causes an infinite quantity change.
While a linear curve has a constant slope, its elasticity varies at different points along the line.
Bowed curves usually represent indifference curves in consumer choice theory, not standard price elasticity.
Question 5/ 10
Using the midpoint method, calculate the percentage change in quantity if the quantity demanded moves from 100 to 150 units.
The midpoint method uses the average of the start and end values as the denominator.
The midpoint is 125; the change of 50 divided by 125 equals 0.40 or 40%.
This result comes from using the initial value of 100 as the base, which the midpoint method avoids to maintain consistency.
This result comes from using the final value of 150 as the base, rather than the average of the two points.
This value would result if the change was 50 and the midpoint was 200, which is not the case here.
Question 6/ 10
If a business owner finds that demand for their product is inelastic, how will an increase in price affect their total revenue?
Consider whether the percentage gain from a higher price is larger or smaller than the percentage loss from fewer units sold.
When demand is inelastic, the price increase outweighs the relatively small drop in quantity sold, leading to higher total revenue.
This outcome occurs when demand is elastic, as the percentage drop in quantity sold would exceed the percentage increase in price.
This would only happen if demand had unit elasticity, where the price and quantity changes exactly offset each other.
This describes the behavior along a linear demand curve as one moves from the inelastic range to the elastic range, but the question specifies a purely inelastic scenario.
Question 7/ 10
What does a negative cross-price elasticity of demand between two goods indicate?
Think about how the price of computers affecting the demand for software would be measured.
A negative value means that an increase in the price of one good leads to a decrease in the demand for the other, which is characteristic of goods used together.
Substitutes have a positive cross-price elasticity because an increase in the price of one encourages consumers to buy more of the other.
Inferiority is determined by income elasticity, not the price of a related good.
Inelasticity refers to a good's response to its own price, whereas cross-price elasticity involves two different goods.
Question 8/ 10
Why is the price elasticity of supply usually greater in the long run than in the short run?
Consider the physical constraints a manufacturer faces when trying to double production in one week versus one year.
In the short run, firms are often limited by fixed inputs like land or buildings, making them less responsive to price changes.
While true for demand elasticity, this does not explain the behavior of producers on the supply side.
The law of supply is a general principle that applies to both short and long time horizons; only the magnitude of the response differs.
Income changes shift the demand curve but do not determine the elasticity (the slope/responsiveness) of the supply curve itself.
Question 9/ 10
In the context of the wheat market, why might a technological advance that increases the harvest be 'bad news' for farmers?
Analyze how total revenue changes when a supply shift meets a demand curve that is very steep.
Since consumers don't buy much more wheat when prices fall, the drop in price per bushel hurts farmers more than the increase in quantity helps them.
Supply is generally not perfectly elastic, and technological improvements typically lower production costs rather than raising them.
Higher yields for farmers do not directly equate to higher societal incomes, and the primary issue is the price reaction to supply shifts.
The phenomenon described in the text occurs even in a domestic market due to the inelastic nature of food demand.
Question 10/ 10
According to the analysis of illegal drugs in Chapter 5, what is a likely consequence of successful drug interdiction that reduces supply?
Think about how the total expenditure of an addict changes when the price of their 'necessity' goes up.
Because addicts' demand is inelastic, they will spend more total money on drugs at higher prices, potentially turning to more crime to fund the habit.
Addiction makes demand inelastic, meaning quantity falls only slightly even when prices rise significantly due to interdiction.
If demand is inelastic, a decrease in supply leads to higher total revenue for sellers because the price increase is proportionately larger than the quantity decrease.
While some substitution may occur, the text highlights that interdiction primarily shifts the supply curve, not the demand curve.