If the four-firm concentration ratio for industry X is 80,

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The four-firm concentration ratio is a measure used to assess the degree of concentration in an industry. It is calculated by adding up the market shares of the four largest firms in the industry. If the four-firm concentration ratio for industry X is 80, it means that the combined market share of the four largest firms in that industry is 80 percent of the total sales in the industry. This indicates a high level of market concentration, suggesting that these firms have significant market power. However, it does not necessarily mean that each of the four firms individually accounts for exactly 20 percent; the 80 percent could be distributed among the four firms in various ways.

If the Four-Firm Concentration Ratio for Industry X Is 80