单选题 An analyst does research about perfect competition. In a perfect competition market, the market's demand curve is most likely
A. less elasticthan a single firm's demand curve.
B. equally elastic as a single firm's demand curve.
C. more elastic than a single firm's demand curve.

【正确答案】 A

【答案解析】[解析] 完全竞争市场中，单个企业的需求线是平行线(弹性为无穷大)，而市场的需求线是正常的向下倾斜的线(弹性大于零)，价格需求弹性一般为负值，但这里所讲的大小，是讲它们的绝对值。所以，市场需求线比单个企业的需求线更没有弹性。