需求的收入弹性 Income elasticity of demand
（重定向自Income elasticity）
需求的收入弹性 在经济学中，指衡量一种物品的需求对消费者收入变化的反应程度。
关于劣质商品、必需品和奢侈品
收入弹性为负的物品定义为劣质商品。
收入弹性为正的物品定义为正常物品：
┅如果 0 ≤ 需求的收入弹性 ≤ 1，这类物品为必需物品； ┅如果 需求的收入弹性＞ 1，这类物品为奢侈物品。
Income elasticity
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英语百科
Income elasticity of demand 需求的收入弹性
（重定向自Income elasticity）
In economics, income elasticity of demand measures the responsiveness of the quantity demanded for a good or service 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 quantity demanded to the percentage change in income. For example, if in response to a 10% increase in income, the quantity demanded for a good increased by 20%, the income elasticity of demand would be 20%/10% = 2.
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