单选题 For which the following four-firm concentration ratios and Herfindahl-Hirschman indexes (HHI) indicates a highly competitive market? Four-Firm Ratio HHI ①A. 5% 150 ②B. 98% 9500 ③C. 98% 150

A、

A. ①
B、

B. ②
C、

C. ③

【正确答案】 A

【答案解析】For both the four-firm ratio and the HHI, the lower the market concentration measure, the greater the degree of competition.