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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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AGGREGATE DEMAND DECREASE, SHORT-RUN AGGREGATE MARKET

A shock to the short-run aggregate market caused by a decrease in aggregate demand, resulting in and illustrated by a leftward shift of the aggregate demand curve. A decrease in aggregate demand in the short-run aggregate market results in a decrease in the price level and a decrease in real production. The level of real production resulting from the shock can be greater or less than full-employment real production.

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Today, you are likely to spend a great deal of time searching the newspaper want ads seeking to buy either looseleaf notebook paper or a three-hole paper punch. Be on the lookout for celebrities who speak directly to you through your television.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"Difficulties mastered are opportunities won. "

-- Winston Churchill, Statesman

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Confederation of British Industry
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