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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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DISEQUILIBRIUM, AGGREGATE MARKET

The state of the aggregate market in which real aggregate expenditures are NOT equal to real production, which results in an imbalance that induces a change in the price level, aggregate expenditures, and/or real production. In other words, the opposing forces of aggregate demand (the buyers) and aggregate supply (the sellers) are out of balance. At the existing price level, either the four macroeconomic sectors (household, business, government, and foreign) are unable to purchase all of the real production that they seek or producers are unable to sell all of the real production that they have.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers seeking to buy either a genuine down-filled snow parka or throw pillows for your living room sofa. Be on the lookout for door-to-door salesmen.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"There's only one corner of the universe you can be certain of improving and that's your own self. "

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