老师是不是不管哪种市场结构，都是若是均衡条件的话，短期均衡是MR=MC 长期均衡是P=ATC

问题如下：

A company doing business in a monopolistically competitive market will most likely maximize profits when its output quantity is set such that:

选项：

A.

average cost is minimized.

B.

marginal revenue equals average cost.

C.

marginal revenue equals marginal cost.

解释：

C is correct.

The profit maximizing choice is the level of output where marginal revenue equals marginal cost.

考点：垄断竞争

解析：无论是哪一种市场结构，厂商想要获得利润最大化的条件都是MR=MC，垄断竞争市场上的厂商也不例外。