需求的交叉弹性(Cross-Price Elasticity of Demand)是指某种其他物品的价格每变化1%，会使该物品的需求量变化百分之几，由这个概念我们可以推导出替代品、互补品这两个经济学中的重要概念。

A商品的B商品进行需求的交叉弹性比较，Px表示A商品的价格，Qy表示B商品的数量，

则交叉弹性为：

当需求的交叉弹性是正值的时候，A和B均为对方的替代品(Substitute Goods)。
当需求的交叉弹性是负值的时候，A和B均为对方的互补品(Complement Goods)。

许多人用需求交叉弹性来计量某些产品的差异程度。

In economics, the cross elasticity of demand or cross-price elasticity of demand measures the responsiveness of the quantity demanded for a good to a change in the price of another good, ceteris paribus. It is measured as the percentage change in quantity demanded for the first good that occurs in response to a percentage change in price of the second good. For example, if, in response to a 10% increase in the price of fuel, the demand of new cars that are fuel inefficient decreased by 20%, the cross elasticity of demand would be: . A negative cross elasticity denotes two products that are complements, while a positive cross elasticity denotes two substitute products. Assume products A and B are complements, meaning that an increase in the demand for A accompanies an increase in the quantity demanded for B. Therefore, if the price of product B decreases, the demand curve for product A shifts to the right, increasing A's demand, resulting in a negative value for the cross elasticity of demand. The exact opposite reasoning holds for substitutes.