Eduqas A-Level Business A510QS
Enterprise, Business Plans and Location
Markets, Demand and Market Research
Business Structure and Sources of Finance
Revenue, Costs and Break-Even
Marketing and the Marketing Mix
Financial Planning and Accounts
People in Organisations
Motivation, Management and Employee Relations
Operations Management
Data and Market Analysis
Analysing Business Performance
Aims, Objectives and Strategy
Decision-Making and Investment Appraisal
Change and Risk Management
PEST Factors and the External Environment
Ethical, Legal and Environmental Factors
International Trade, Globalisation and the European Union
Data and Market Analysis
Income elasticity of demand
- 3 things to know
- Component 2
Overview
Measuring how demand responds to a change in earnings, and what the sign tells you about whether a good is normal, luxury or inferior.
What you need to know
Answer each one before you reveal it.
Consumer income rises by 5% and demand rises from 800 to 880 units. Calculate income elasticity of demand.
Consumer income rises by 4% and demand falls from 2,500 to 2,400 units. Calculate income elasticity of demand.
Questions from this subtopic
Each one with the model answer underneath.
- 1
State the formula for income elasticity of demand.
Model answer
Income elasticity of demand equals the percentage change in quantity demanded divided by the percentage change in real income. Each percentage is measured from the original figure.
- 2
Consumer income rises by 5% and demand rises from 800 to 880 units. Calculate income elasticity of demand.
Model answer
Quantity rises by 10%, so elasticity is 10 divided by 5. The coefficient is +2.0.
- 3
Consumer income rises by 4% and demand falls from 2,500 to 2,400 units. Calculate income elasticity of demand.
Model answer
Quantity falls by 4%, so elasticity is −4 divided by 4. The coefficient is −1.0.
- 4
Consumer income rises by 8% and demand for a product rises by 2%. Calculate income elasticity of demand.
Model answer
Elasticity is 2 divided by 8, giving a coefficient of +0.25. Demand has risen, but by proportionately less than income.
- 5
What does a positive income elasticity coefficient tell a business?
Model answer
Demand for the product moves in the same direction as consumer income. The product is a normal good, so sales grow as the economy grows.
- 6
What does a negative income elasticity coefficient tell a business?
Model answer
Demand for the product moves in the opposite direction to consumer income. The product is an inferior good, so sales rise when incomes fall.
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