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AGGREGATE PRODUCTION FUNCTION: A relation between the total production of real output for an economy and the amount of labor input. The aggregate production function is comparable to the standard production function used in the microeconomic analysis of firm behavior but is applied to the macroeconomic study of aggregate supply, resource markets, and employment. It is typically assumed to experience diminishing marginal returns, resulting in a decreasing marginal product of labor.

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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.

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


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AGGREGATE MARKET

An economic model relating the price level and real production that is used to analyze business cycles, gross production, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The aggregate market, inspired by the standard market model, but adapted to the macroeconomy, captures the interaction between aggregate demand (the buyers) and short-run and long-run aggregate supply (the sellers). Also known by the names AS-AD model or income-price model, the aggregate market is THE cornerstone model of macroeconomic analysis.

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Today, you are likely to spend a great deal of time at an auction seeking to buy either storage boxes for your income tax returns or an AC adapter for your CD player. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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It's estimated that the U.S. economy has about $20 million of counterfeit currency in circulation, less than 0.001 perecent of the total legal currency.
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