Income Elasticity of Demand - tutor2u notes + video
The amount that customers demand is affected by price (PED). However, it is also affect by the incomes of consumers. This leads onto another important elasticity – the income elasticity of demand (often shortened to YED). Income elasticity of demand measures the relationship between a change in quantity demanded for good X and a change in real income. The formula for calculating income elasticity is: % change in demand divided by the % change in income Most products have a positive income elasticity of demand . So as consumers' income rises more is demanded at each price. 1. Normal necessities have an income elasticity of demand of between 0 and +1 for example, if income increases by 10% and the demand for fresh fruit increases by 4% then the income elasticity is +0.4. Demand is rising less than proportionately to income. 2. Luxury goods and services have an income elasticity of demand > +1 i.e. demand rises more than proportionate to a change in income – for ex...