Suppose an industry consists of 20 firms. Each firm's share of total sales in the industry is 5 percent. If two of the firms merge, then the four-firm concentration ratio in the industry will

A) remain unchanged.
B) decrease as there are fewer firms in the industry.
C) increase.
D) depend on the market condition faced by the industry.

Answer: C

Economics

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If two events are perfectly positively correlated, then

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