单选题 Which of the following is a characteristic of perfect competition?

A. There are a few sellers.
B. The products of different firms are sold at different prices.
C. There are no barriers to entry into the market.

【正确答案】 C

【答案解析】The only true statement listed in the question is that, under perfect competition there are no barriers to entry into the market. Each of the other possible answers is not a characteristic of perfect competition. While the competitors can earn positive economic profits in the short-run, they cannot earn long term economic profits due to ease of entry and exit.