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01:48 Monopoly and Antitrust - The Four-Firm… Monopoly and Antitrust - The Four-Firm Concentration Ratio.mp4	Monopoly and Antitrust - The Four-Firm Concentration Ratio.mp4 Monopoly and Antitrust - The Four-Firm Concentration Ratio. Image provided by OpenStax. percent market firms concentration glass share ratio lecture bye wishes care herfindahl hirschman hhi improvement measurements department justice equals figure From Richard Gosselin 0 likes 0 Creative Commmons License Attribution: CC BY