The table below shows a household's annual demand for four different goods (W, X, Y and Z) at two levels of annual income.
| Annual Income | Good W | Good X | Good Y | Good Z |
|---|---|---|---|---|
| £60,000 | 400 | 400 | 400 | 400 |
| £75,000 | 540 | 500 | 440 | 400 |
When income changes from £60,000 to £75,000, for which good does the household have an income elasticity of demand of unity?
Good W
Good X
Good Y
Good Z
256 exam-style questions on AQA A Level Economics 1.3 Price determination in a competitive market, covering 1.3.1 The determinants of the demand for goods and services, 1.3.2 Price, income and cross elasticities of demand, 1.3.3 The determinants of the supply of goods and services, 1.3.4 Price elasticity of supply, 1.3.5 The determination of equilibrium market prices, and 1.3.6 The interrelationship between markets. Each one has a worked solution and a mark scheme showing where the marks go.