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Marketing

Price and income elasticity of demand

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Overview

Recall questions on price and income elasticity of demand, their formulas and calculations, elastic and inelastic demand, effects on sales revenue, what makes demand price elastic, and the limitations of elasticity.

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Answer each one before you reveal it.

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Key term

What is price elasticity of demand?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is price elasticity of demand?

    Model answer

    Price elasticity of demand measures how much the quantity demanded of a product changes in response to a change in its price.

  2. 2

    State the formula for price elasticity of demand.

    Model answer

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

  3. 3

    Why is price elasticity of demand normally a negative figure?

    Model answer

    Price and quantity demanded move in opposite directions, so one of the two percentage changes is negative and the result of dividing them is negative.

  4. 4

    What value of price elasticity separates elastic from inelastic demand?

    Model answer

    A value of 1, ignoring the sign; above 1 demand is price elastic and below 1 it is price inelastic.

  5. 5

    A business raises its price by 10% and quantity demanded falls by 4%. Calculate the price elasticity of demand.

    Model answer

    Price elasticity of demand is −0.4, because −4 divided by 10 is −0.4, so demand is price inelastic.

  6. 6

    A business cuts its price from £20 to £18 and weekly sales rise from 4,000 to 5,000 units. Calculate the price elasticity of demand.

    Model answer

    Price elasticity of demand is −2.5, because quantity rose by 25% while price fell by 10%, and 25 divided by −10 is −2.5.

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