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
【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.