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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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CONSUMER EQUILIBRIUM

The condition that exists when the last dollar spent on one good provides the same marginal utility as the last dollar spent on every other good. In consumer equilibrium, income is allocated between the purchase of different goods in such a way that the level of utility cannot be increased, that is, utility maximization has been achieved.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites hoping to buy either hand lotion, a big bottle of hand lotion or a lighted magnifying glass. Be on the lookout for broken fingernail clippers.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"Good judgment comes from experience, and often experience comes from bad judgment."

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