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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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REGRESSIVE TAX

A tax in which the proportion of income paid in taxes is smaller for higher income levels. A regressive income tax exists if taxpayers with more income pay a lower tax rate relative to income as income increases. A regressive tax is one of three alternations. The other two are progressive tax, in which the proportion of income paid in taxes is greater for higher income levels, and proportional tax, in which the proportion of income paid in taxes is the same for all income levels.

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