Income Elasticity of Demand
A measure of the relationship between a change in income and a change in quantity of a good demanded:
Investopedia Commentary
The degree to which a demand for a good changes with respect to a change in income depends on whether the good is a necessity or a luxury. The demand for necessities will increase with income, but at a slower rate. This is because consumers, instead of buying more of only the necessity, will want to use their increased income to buy more of a luxury. During a period of increasing income, demand for luxury products tends to increase at a higher rate than the demand for necessities.
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See also: Demand, Economics, Elasticity, Equilibrium, Income, Price Elasticity of Demand, Pricing Power, Supply