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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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MARKET CLEARING

A condition of the market in which the quantity demanded is equal to the quantity supplied, such that the market is "clear" of any shortage or surplus. Market clearing is a common, non-technical term for equilibrium. In a market graph, the market clearing is found at the intersection of the demand curve and the supply curve.

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Today, you are likely to spend a great deal of time strolling through a department store trying to buy either a pair of blue silicon oven mitts or a coffee cup commemorating the 2000 Olympics. Be on the lookout for a thesaurus filled with typos.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
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