单选题 A firm has the following characteristics: Relatively small in size Marginal revenue is equal to the selling price Economic profits will not be earned for any significant period of time The firm is best described as existing in a(n):

A、

A. purely competitive market.
B、

B. price searcher market.
C、

C. monopolistic market structure.

【正确答案】 A

【答案解析】The firm being described is a price taker firm in a purely competitive market. These firms must sell their product at the going market price, there are no barriers to entry, and there are a large number of firms that produce a homogeneous product.