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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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MARGINAL UTILITY AND DEMAND

An explanation of the law of demand and the negatively-sloped demand curve based on utility analysis and the law of diminishing marginal utility. The law of diminishing marginal utility states that marginal utility declines as consumption increases. Because demand price depends on the marginal utility obtained from a good, price also declines as consumption increases, meaning price and quantity demanded are inversely related, which is the law of demand.

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Today, you are likely to spend a great deal of time driving to a factory outlet wanting to buy either a birthday greeting card for your mother that doesn't look like a greeting card or a handcrafted spice rack. Be on the lookout for gnomes hiding in cypress trees.
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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.
"A leader is most successful when people barely know he exists. When his work is done, his aim fulfilled, his troops will feel they did it themselves. "

-- Lao-Tzu, philosopher

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International Securities Market Association
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