问题
单项选择题
A firm operates in an industry characterized by monopolistic competition. When the price of the firm's one product increases from $40 to $60, the quantity demanded for the firm's another product decreases from 90 to 50. The cross elasticity of demand is cLosest to:（）
A. -0.70
B. -1.43
C. -2.00
答案
参考答案：B
解析：
需求的交叉弹性计算如下：[(50-90)/70]/[(60-40)/50]=-0.5714/0.4=-1.428，一种产品价格上升，而导致另一种产品需求量减少，则两者是补充关系。