According to one rule of thumb,a four-firm concentration ratio of greater than 40 percent for the industry is considered to be an oligopoly.

Name: According to one rule of thumb,a four-firm concentration ratio of greater than 40 percent for the industry is considered to be an oligopoly.
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The statement is correct. A four-firm concentration ratio of greater than 40% is considered to be an indicator of an oligopoly market structure.

According to One Rule of Thumb,a Four-Firm Concentration Ratio of Greater