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Herfindahl-Hirschman Index |
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Herfindahl-Hirschman Index An index of market concentration the U.S. Department of Justice uses to determine whether a monopoly is forming. The scale goes from zero to 10,000, with 10,000 indicating that a single company controls 100% of the market share in a given industry. An HHI of less than 1000 indicates a market with little concentration, which the Justice Department prefers. Any merger or acquisition leading to an increase of more than 100 when the HHI was previously greater than 1,800 may lead to antitrust action against the company involved. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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A net sales based Herfindahl index reflects the degree to which revenues are concentrated in just a few of a company's business segment, and calculated across n business segments as the sum of squares of each segment i's sales, [S. The Herfindahl index is a measure of market concentration calculated as the sum of the squares of each bank's market share, which is defined in terms of total bank deposits. According to the antitrust criteria of the Department of Justice, an industry with a Herfindahl index of less than 1,000 is considered unconcentrated. |
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