NO.PZ2016010802000068
问题如下:
Companies most likely have a well-defined supply function when the market structure is:
选项:
A.oligopoly.
B.perfect competition.
C.monopolistic competition.
解释:
B is correct.
A company in a perfectly competitive market must accept whatever price the market dictates. The marginal cost schedule of a company in a perfectly competitive market determines its supply function.
考点:完全竞争市场特性
解析:在四类市场结构中,只有完全竞争市场的供给曲线是可以被定义描述的,它等于MC曲线大于AVC的那一段。
注意到,只有完全竞争厂商才有MR=P所以MC=MR=P, 在MC曲线上, P与产量方能对应。
但是对于其他类型的市场,P≠MR=MC,所以MC上点与产量对应不起来。所以只有完全竞争市场才存在这样的供给曲线。
其他三种为什么不可以被定义描述?