Industry A is composed of three firms.  One has an 80% market share, and the other two have a 10% share each.  The Herfindahl index for this industry is:

Microeconomics
13th Edition
ISBN:9781337617406
Author:Roger A. Arnold
Publisher:Roger A. Arnold
Chapter12: Government And Product Markets: Antitrust And Regulation
Section12.1: Antitrust
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Industry A is composed of three firms.  One has an 80% market share, and the other two have a 10% share each.  The Herfindahl index for this industry is:

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