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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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REAL-BALANCE EFFECT

A change in aggregate expenditures on real production made by the household, business, government, and foreign sectors that results because a change in the price level alters the purchasing power of money. This is one of three effects underlying the negative slope of the aggregate demand curve associated with a movement along the aggregate demand curve and a change in aggregate expenditures. The other two are interest-rate effect and net-export effect. The real-balance effect is somewhat analogous to the income effect underlying the negative slope of the market demand curve.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a large red and white striped beach towel or a bottle of blackcherry flavored spring water. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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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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