Cross elasticity of demand (XED) measures the percentage change in quantity demand for a good after a change in the price of another. 需求的交叉弹性（XED）衡量的是一种商品的价格发生变化后交叉价格弹性，对另一种商品的需求量的百分比变化。
For example: if there is an increase in the price of tea by 10%. and the quantity demanded for coffee increases by 2%, then the cross elasticity of demand = 2/10 = +0.2 如果茶叶的价格增加了10%交叉价格弹性，而咖啡的需求量增加了2%，那么，需求的交叉弹性=2/10=+0.2。
Substitute Goods and XED 替代商品和XED
Explanation of XED (Tea and coffee) XED（茶和咖啡）的解释
% change in Q.D. = (210-200)/200 = 10/200 = 5%
% change in price (1.5-1.2)/1.2 = 0.3/1.2 = 25%
Complementary Goods and XED 补充性商品和XED
These are goods which are used together, therefore the cross elasticity of demand is negative. If the price of one goes up, you will buy less of both goods. 这些是一起使用的商品，因此，需求的交叉弹性是负的。如果一种商品的价格上涨，你就会减少对两种商品的购买。
Using knowledge of cross elasticity of demand 利用需求交叉弹性的知识
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