【高频考点】CFA一级必考之Elasticity

弹性（Elasticity）是CFA一级经济学中一个非常重要的考点，没接触过的同学会觉得很难理解。下面小编就为大家梳理一下弹性中的重要公式，方便大家对照复习。

1. Own-Price Elasticity of Demand

This equation expresses the sensitivity of the quantity demanded to a change in price. 描述的是X商品的需求量对X价格的敏感程度。

2. Income Elasticity of Demand

Income elasticity of demand is defined as the percentage change in quantity demanded () divided by the percentage change in income (%∆I), holding all other things constant. 描述的是X商品的需求量对收入水平的敏感程度。

3. Cross-Price Elasticity of Demand

The price of another good might also have an impact on the demand for that good or service, and we should be able to define an elasticity with respect to the other price (P_y) as well. 描述的是X商品的需求量对Y商品价格的敏感程度。

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