Income Elasticity of Demand – Concept and Types
The income elasticity of demand shows the responsiveness of quantity demanded of a certain commodity to the change in income of the consumer. The income elasticity of demand is also defined as the ratio of the percentage change in the demand for a commodity to the percentage change in income. Income elasticity of demand can be expressed as follows: Income elasticity (ey) = Percentage change in quantity demanded / Percentage change in income For example, consumer’s income rises from $ 100 to $ 102, his demand for good X increases from 25 units per week to 30 units per week then his income elasticity of demand X is: ey = 5/25 x 100/2 = 10. It means that 1 percent increase in income results 10 percent increase in demand and vice versa. The income elasticity may be positive or negative or zero depending upon the nature of a commodity. As a Continue reading