问题
单项选择题
Which of the following concentration ratios are most likely to be associated with a perfectly competitive industryFour-firm concentration ratio Herfindahl-Hirschman Index（） ①A.125 1000 ②B.85 25 ③C.25 100
A. ①
B. ②
C. ③
答案
参考答案：C
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.