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The top six firms in an oligopolistic industry have market shares of 25%, 25%, 15%, 10%, 6%, and 3%. Many smaller firms split the rest of the market. What is the value of the four-firm concentration ratio?

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The top six firms in an oligopolistic industry have market shares of 25%, 25%, 15%, 10%, 6%, and 3%. Many smaller firms split the rest of the market. What is the value of the four-firm concentration ratio?






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