To economists, businesses and policy makers the level of competition is a significant issue which may be measured through the use of concentration ratios. Consequently, concentration ratios determine the market size of firms in an industry with the most common measures being four firms and eight firms concentration ratios. The four firm concentration ratio considers the market concentration of the four larges firms in an industry.

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To economists, businesses and policy makers the level of competition is a significant issue which may be measured through the use of concentration ratios. Consequently, concentration ratios determine the market size of firms in an industry with the most common measures being four firms and eight firms concentration ratios. The four firm concentration ratio considers the market concentration of the four larges firms in an industry.

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