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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 INCREASE, SHORT-RUN AGGREGATE MARKET

A shock to the short-run aggregate market caused by an increase in aggregate demand, resulting in and illustrated by a rightward shift of the aggregate demand curve. An increase in aggregate demand in the short-run aggregate market results in an increase in the price level and an increase 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 at an auction wanting to buy either a pair of designer sunglasses or looseleaf notebook paper. Be on the lookout for mail order catalogs with hidden messages.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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