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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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KEYNESIAN EQUILIBRIUM

The state of macroeconomic equilibrium identified by the Keynesian model when the opposing forces of aggregate expenditures equal aggregate production achieve a balance with no inherent tendency for change. Once achieved, a Keynesian equilibrium persists unless or until it is disrupted by an outside force, especially changes in autonomous expenditures.

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