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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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PRODUCT LIFE CYCLE The different stages that a product traverses over the course of its life from initial availability (birth) to eventual unavailability (death). The key stages are development, introduction, growth, maturity, saturation, and decline. The product life cycle, represented by an S-shaped curve, is an adaptation of the biological life cycle and is common to the study of marketing. It is also important in the analysis of innovation and economic instability. In addition to biological growth, comparable S-shaped life cycles are found in short-run production of a firm, the growth of a person's income, the acquisition of knowledge, and the development of a civilization.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time watching the shopping channel hoping to buy either a pair of handcrafted oven mitts or a coffee table shaped like the state of Florida. Be on the lookout for malfunctioning pocket calculators.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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"Sometimes our light goes out, but is blown into flame by another human being. Each of us owes deepest thanks to those who have rekindled this light. " -- Albert Schweitzer, missionary physician
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BJE
Bell Journal of Economics
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