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major firms Herfindahl: Original post by Sean Mullin of Demand Media The Herfindahl-Hirschman Index (HHI) measures the market share of the major firms in a single industry to determine and prevent monopolization and antitrust violations. The HHI scores market share using numbers in the thousands: according to 2010 merger guidelines published by the Department of Justice and Federal Trade Commission, markets scoring below…

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