The table below shows the market shares for the only firms in a domestic cement market.
TABLE 11-1
-Refer to Table 11-1.The four-firm concentration ratio in this industry is ________%.

Question

The table below shows the market shares for the only firms in a domestic cement market.
  TABLE 11-1
-Refer to Table 11-1.The four-firm concentration ratio in this industry is ________%.

Quizplus · Accepted Answer

The four-firm concentration ratio is calculated by adding up the market shares of the top four firms in the industry. In this case, the top four firms have market shares of 25%, 20%, 20%, and 20%, respectively. Adding these up gives us a four-firm concentration ratio of 85%. Therefore, the correct answer is C.

The Table Below Shows the Market Shares for the Only