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.

     See also | market share | oligopoly | concentration ratio | market control | antitrust laws |

HERFINDAHL-HIRSHMAN INDEX, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2023. [Accessed: June 4, 2023].

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The official factor payment item in the National Income and Product Accounts maintained by the Bureau of Economics Analysis measuring the combined payments for all four factors of production used in owner-operated business firms. Specifically, proprietors' income is the excess of revenue over explicit production cost of owner-operated businesses and includes payments for labor, capital, land, and entrepreneurship. This is one of five official factor payments making up national income. The other four are compensation of employees, rental income of persons, net interest, and corporate profits. Proprietors' income is usually less than 10 percent of national income, typically in the 7 to 10 percent range.

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