NO.PZ2023010401000054
问题如下:
An analyst gathered the following market share data for an industry comprised of six firms:
So, the industry’s four-firm concentration ratio and Herfindahl-Hirschman index are closest to:
选项:
A.A. Four-firm concentration ratio:50% , HHI:1750
B.B. Four-firm concentration ratio:90% , HHI:1750
C.C. Four-firm concentration ratio:80% , HHI:1950
解释:
The four-firm concentration ratio=30%+20%+15%+15%=80%The Herfindahl-Hirschman
The Herfindahl-Hirschman index=302+202+152+152+102+102=1950
比如前四个公司,我看第一个就是取了前面四个百分数直接加总,HHI就是把并列的算成一个,能给个确定的说法不?