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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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MARKET STRUCTURES The manner in which markets or industries are organized, based largely on the number of participants in the market or industry and the extent of market control of each participant. Perfect competition represents the benchmark market structure that contains a large number of participants on both sides of the market, and no market control by any firm. Three market structure models with varying degrees of market control on the supply side of the market are: monopoly, monopolistic competition, and oligopoly. Three lesser known market structures with varying degrees of market control on the demand side of the market are: monopsony, oligopsony, and monopsonistic competition.
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The average bank teller loses about $250 every year.
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"Habit is a cable; we weave a thread of it each day, and at last we cannot break it. " -- Horace Mann, educator
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SWIFT
Society for Worldwide Interbank Financial Telecommunications
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