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HERFINDAHL 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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UTILITY ANALYSIS

A subset of consumer demand theory that analysis consumer behavior and market demand using total utility and marginal utility. The key principle of utility analysis is the law of diminishing marginal utility, which offers an explanation for the law of demand and the negative slope of the demand curve.

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Today, you are likely to spend a great deal of time surfing the Internet hoping to buy either a how-to book on building remote controlled airplanes or an extra large beach blanket. Be on the lookout for poorly written technical manuals.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
"He who hesitates is poor. "

-- Mel Brooks, writer, director, comedian

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Journal of Economic Perspectives
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