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Elasticity of Demand

Calculating and interpreting price elasticity, and what determines it

  • 3 things to know
  • Unit AS 2

Overview

Formula for price elasticity of demand and price elasticity of demand of zero.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Key term

What do price elasticity values above one, of exactly one and of zero each mean?

Numbers

State the formula for price elasticity of demand.

Key term

Why is the value of price elasticity of demand normally negative?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    State the formula for price elasticity of demand.

    Model answer

    Price elasticity of demand = percentage change in quantity demanded ÷ percentage change in price.

  2. 2

    Why is the value of price elasticity of demand normally negative?

    Model answer

    Price and quantity demanded move in opposite directions, so one percentage change is positive while the other is negative; the sign is usually ignored and the size of the value used.

  3. 3

    What range of values indicates that demand is price elastic?

    Model answer

    A value greater than 1, ignoring the sign, because quantity demanded changes proportionately more than price.

  4. 4

    What does a price elasticity value of exactly 1 mean?

    Model answer

    Demand is unitary elastic: quantity demanded changes by the same percentage as price, so total revenue is unchanged.

  5. 5

    What does a price elasticity of demand of zero mean?

    Model answer

    Demand is perfectly inelastic, so the quantity bought does not change at all when the price changes.

  6. 6

    A 10% rise in price causes quantity demanded to fall by 25%. Calculate the price elasticity of demand and state what it shows.

    Model answer

    Price elasticity of demand = −25 ÷ 10 = −2.5, so demand is price elastic and the price rise will reduce total revenue.

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