Question 1

How does the slope of a demand curve differ from elasticity?

Accepted Answer

Slope measures the rate at which quantity demanded changes as price changes, but it depends on measurement units, making comparisons across products difficult. Elasticity measures the percentage change in quantity demanded from a one percent price change and is unit-free, enabling standardized comparisons across different markets and products.

Question 2

Why is elasticity considered a more standardized measure than slope?

Accepted Answer

Elasticity is not affected by units of measurement, allowing direct comparisons of price sensitivity across diverse products and markets. A product priced in dollars has the same elasticity value as one priced in euros if their price responsiveness is identical, whereas slope values would differ based on currency units.

Question 3

Can a linear demand curve have constant slope but varying elasticity?

Accepted Answer

Yes. A linear demand curve maintains a constant slope throughout, but elasticity varies at different points along the curve. This occurs because elasticity depends on the ratio of price to quantity demanded, which changes as you move along the curve despite the slope remaining constant.

Question 4

What is the mathematical relationship between slope and elasticity?

Accepted Answer

Elasticity equals the inverse of the slope multiplied by the ratio of price to quantity demanded. This relationship shows that on a linear demand curve, elasticity varies along the curve because the price-to-quantity ratio changes, even though the slope remains constant.

Question 5

Why does using different currency units affect demand curve slope?

Accepted Answer

Slope is calculated as the change in quantity divided by the change in price, so it depends directly on the units used for measurement. A good priced in dollars produces a different slope than the same good priced in cents, even though the underlying price responsiveness is identical.

Question 6

How does elasticity measure price responsiveness more effectively than slope?

Accepted Answer

Elasticity captures price responsiveness as a percentage change, providing a unit-free measure that reflects how sensitive quantity demanded is to price changes. Slope alone cannot measure this responsiveness consistently because it varies with measurement units and doesn't account for the relative magnitudes of price and quantity.

Question 7

What limitation does slope have when comparing different products?

Accepted Answer

Slope depends on the units used for price and quantity, making it impossible to compare price responsiveness across products measured in different units. For example, degrees of elasticity of demand and the demand graph show how elasticity enables such comparisons, whereas slope values would be incomparable without unit standardization.

Élasticité-prix et pente

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