问题
单项选择题
Which of the following most accurately describes why firms under monopolistic competition face elastic demand for their products（）
A. High barriers to entry.
B. The availability of many complementary goods.
C. The availability of many close substitutes.
答案
参考答案：C
解析：
The demand for products from firms competing in monopolistic competition is relatively elastic due to the availability of close substitutes. If a firm increases its product price, it will lose customers to firms selling slightly differentiated products at lower prices.