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The Herfindahl-Hirschman Index (HHI) is a measure of how evenly market share is distributed across insurers in the market. HHI values range from 0 to 10,000, with an HHI closer to zero indicating a more competitive market and closer to 10,000 indicating a less competitive market. An HHI index below 1,000 generally indicates a highly competitive market; an HHI between 1,000 and 1,500 indicates an unconcentrated market; a score between 1,500 and 2,500 indicates moderate concentration; and a value above 2,500 indicates a highly concentrated (uncompetitive) market.
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