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HERFINDAHL 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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NATURAL UNEMPLOYMENT

The combination of frictional and structural unemployment that persists in an efficient, expanding economy when labor and resource markets are in equilibrium. Natural unemployment exists when the economy is at full employment, which for practical purposes is defined as the condition in which the quantity of resources demanded is equal to the quantity of resources supplied. Most important for policy purposes, natural employment exists with stable prices, that is, no inflation.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either several magazines on computer software or a T-shirt commemorating the second moon landing. Be on the lookout for telephone calls from long-lost relatives.
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General Electric is the only stock from the original 1896 Dow Jones Industrial Average remaining in the current index.
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