Consider an industry that is made up of nine firms, each with a market share (percent of sales)as follows:
A.Firm A: 30%
B.Firm B: 20%
C.Firms C, D, and E: 10% each
D.Firms F, G, H, and J: 5% each
What is the value of the four-firm concentration ratio and how is the industry categorized?
A)50%; monopolistic competition
B)70%; oligopoly
C)75%; oligopoly
D)80%; strongly oligopolistic

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The Answer of Consider an industry that is made up of nine firms, each with a market share (percent of sales)as follows:
A.Firm A: 30%
B.Firm B: 20%
C.Firms C, D, and E: 10% each
D.Firms F, G, H, and J: 5% each
What is the value of the four-firm concentration ratio and how is the industry categorized?
A)50%; monopolistic competition
B)70%; oligopoly
C)75%; oligopoly
D)80%; strongly oligopolistic

Consider an Industry That Is Made Up of Nine Firms