Suppose there are 100 firms in an industry. If the leading firm has a 60 percent market share, the second largest firm has a market share of half the leader's, the third has a market share of half the second's, and the fourth largest has a market share of half the third's, what is the four-firm concentration ratio?
A) 75 percent
B) 85 percent
C) 95 percent
D) 100 percent
E) impossible because their combined market shares exceed 100 percent

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The Answer of Suppose there are 100 firms in an industry. If the leading firm has a 60 percent market share, the second largest firm has a market share of half the leader's, the third has a market share of half the second's, and the fourth largest has a market share of half the third's, what is the four-firm concentration ratio?
A) 75 percent
B) 85 percent
C) 95 percent
D) 100 percent
E) impossible because their combined market shares exceed 100 percent

Suppose There Are 100 Firms in an Industry