单选题 Which of the following concentration ratios are most likely to be associated with a perfectly competitive industry? Four-firm concentration ratio Herfindahl-Hirschman Index ①A. 125 1000 ②B. 85 25 ③C. 25 100

A、

A. ①
B、

B. ②
C、

C. ③

【正确答案】 C

【答案解析】The four-firm concentration ratio can range from zero to 100 percent. The Herfindahl-Hirschman Index has a theoretical range of near zero to 10000. As the level of competition increases, the value of either of the concentration measures decreases. A perfectly competitive market is a market characterized by relatively low concentration measures.