What measures the percentage of an industry's total sales that is controlled by the few largest firms?

Name: What measures the percentage of an industry's total sales that is controlled by the few largest firms?
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Concentration ratio is a measure of the percentage of an industry's total sales that is controlled by the few largest firms. It is calculated by adding up the market shares of the largest firms in the industry. The higher the concentration ratio, the less competition there is in the industry.

What Measures the Percentage of an Industry's Total Sales That