问题
单项选择题
For which the following four-firm concentration ratios and Herfindahl-Hirschman indexes (HHI) indicates a highly competitive marketFour-Firm Ratio HHI （） ①A. 5% 150 ②B. 98% 9500 ③C. 98% 150
A. ①
B. ②
C. ③
答案
参考答案：A
解析：
For both the four-firm ratio and the HHI, the lower the market concentration measure, the greater the degree of competition.