单选题 Which of the following is NOT a condition of a perfectly competitive market?

A. Sellers make economic profits.
B. Firms face elastic demand curves.
C. Individual sellers each have a small share of the market.

【正确答案】 A

【答案解析】The only item listed that is not a condition of a perfectly competitive market is that sellers make economic profits. In fact, sellers do not make economic profit after taking into account their opportunity costs.