Q.

The income elasticity of demand being greater than one, the commodity must be -

A. a necessity
B. a luxury
C. an inferior good
D. None of these
Answer» B. a luxury
Explanation: In economics, income elasticity of demand measures the responsiveness of the demand for a good to a change in the income of the people demanding the good, ceteris paribus. It is calculated as the ratio of the percentage change in demand to the percentage change in income. For example, if, in response to a 10% increase in income, the demand for a good increased by 20%. the income elasticity of demand would be 20%/10% = 2. A positive income elasticity of demand is associated with normal goods: an increase in income will lead to a rise in demand. If income elasticity of demand of a commodity is less than 1, it is a necessity good. If the elasticity of demand is greater than 1, it is a luxury good or a superior good.
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