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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is 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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INTEREST RATES, AGGREGATE DEMAND DETERMINANT

One of several specific aggregate demand determinants assumed constant when the aggregate demand curve is constructed, and that shifts the aggregate demand curve when it changes. An increase in interest rates cause a decrease (leftward shift) of the aggregate curve. A decrease in interest rates an increase (rightward shift) of the aggregate curve. Other notable aggregate demand determinants include the federal deficit, inflationary expectations, and the money supply.

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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either looseleaf notebook paper or a three-hole paper punch. Be on the lookout for malfunctioning pocket calculators.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"The only profit center is the customer. "

-- Peter Drucker, management consultant

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Variable Elasticity of Substitution
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