Suppose that there are two industries, A and B. There are five firms in industry A with sales at $5 million, $2 million, $1 million, $1 million, and $1 million, respectively. There are four firms in industry B with equal sales of $2.5 million for each firm. The four-firm concentration ratio for industry A is:

A. 1.0.
B. 0.7.
C. 0.8.
D. 0.9.


Answer: D

Economics

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