If an industry has 25 firms that collectively have $150 million in total sales and the top four firms in this industry account for $90 million in sales, what is the concentration ratio of the top four firms in this industry?

A. 70 percent
B. 80 percent
C. 60 percent
D. 42 percent


Answer: C

Economics

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Below is the graph depicting the market for regional electricity providers:
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Economics