What is the four-firm concentration ratio if the four largest firms in an industry account for 5 percent,6 percent,7 percent,and 8 percent of total revenue?
A) 26 percent
B) 174 percent
C) 1,680
D) There is enough information given to answer the question, but none of the answers above is correct.
E) There is not enough information given to answer the question.

Question

Quizplus · Accepted Answer

The four-firm concentration ratio is the sum of the market shares of the four largest firms in the industry.

In this case, the market shares are: 
5% + 6% + 7% + 8% = 26%

Therefore, the four-firm concentration ratio is 26%.

What Is the Four-Firm Concentration Ratio If the Four Largest