The four largest firms in a market have the following market shares of total revenue: 20 percent,

Question:

The four largest firms in a market have the following market shares of total revenue: 20 percent, 15 percent, 10 percent, and 5 percent. The ______ in this industry is ________.
A. Four-firm concentration ratio; 50 percent
B. Four-firm concentration ratio; 750 percent
C. Herfindah1-Hirschman Index; 50
D. Herfindah1-Hirschman Index; 2,500

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