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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is 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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EQUILIBRIUM, LONG-RUN AGGREGATE MARKET The state of equilibrium that exists in the long-run aggregate market when real aggregate expenditures are equal to full-employment real production with no imbalances to induce changes in the price level or real production. The opposing forces of aggregate demand (the buyers) and long-run aggregate supply (the sellers) exactly offset each other. At the existing price level, the four macroeconomic sectors (household, business, government, and foreign) purchase all of the real production that they seek and producers sell all of the real production that they have.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
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"People of mediocre ability sometimes achieve outstanding success because they don't know when to quit. Most men succeed because they are determined to. " -- George Allen, U.S. senator
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AIC
Akaike's Information Criterion
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