需求收入弹性编辑本段回目录
Income elasticity The responsiveness of demand to a change in consumer income.
The major determinant of income elasticity of demand is the degree of ‘necessity’ of the goods.
需求收入弹性被用来表示消费者对某种商品需求量的变动对收入变动的反应程度。以Em表示需求收入弹性系数,Q代表需求量,ΔQ代表需求量的变动量,I代表收入,ΔI代表收入的变动量,则需求收入弹性系数的一般表达式为: