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Elasticity of Demand

Income elasticity, cross elasticity, and the limits of elasticity values

  • 3 things to know
  • Unit AS 2

Overview

Formula for income elasticity of demand and formula for cross elasticity of demand.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Key term

How is income elasticity found, and what do +2.5, minus 0.8 and a value between zero and one each tell a business?

Numbers

State the formula for income elasticity of demand.

Numbers

Consumer incomes rise by 4% and demand for a product rises by 10%. Calculate the income elasticity of demand and classify the product.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    State the formula for income elasticity of demand.

    Model answer

    Income elasticity of demand = percentage change in quantity demanded ÷ percentage change in income.

  2. 2

    Consumer incomes rise by 4% and demand for a product rises by 10%. Calculate the income elasticity of demand and classify the product.

    Model answer

    Income elasticity of demand = 10 ÷ 4 = +2.5, so it is a luxury or income-elastic normal good.

  3. 3

    Interpret an income elasticity of demand of −0.8.

    Model answer

    The product is an inferior good, because demand falls as consumer incomes rise.

  4. 4

    What does an income elasticity of demand between 0 and 1 tell a business?

    Model answer

    The product is a normal good but income inelastic, typically a necessity, since demand rises as incomes rise but by proportionately less.

  5. 5

    What are the planning implications for a business whose products have a high positive income elasticity of demand?

    Model answer

    Sales will swing sharply with the economic cycle, so the business should build cash reserves in a boom and consider a less income-sensitive product range.

  6. 6

    Which businesses may see demand rise during a recession, and why?

    Model answer

    Those selling inferior goods such as value ranges and discount retailing, because falling incomes push customers towards cheaper alternatives.

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