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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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IMPERFECT COMPETITION

Markets or industries with two or more sellers and buyers that fail to match the criteria of perfect competition. The most noted examples of imperfect competition are the two market structures with selling-side control--monopolistic competition and oligopoly. Lesser known market structures with buying-side control--monopsonistic competition and oligopsony--are also considered as imperfect competition. Facing no competition, monopoly and monopsony are not included. Most real world markets can be considered imperfect competition.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club seeking to buy either a wall poster commemorating the 2000 Presidential election or a rechargeable flashlight. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
"Good judgment comes from experience, and often experience comes from bad judgment."

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UNCTAD
United Nations Conference on Trade and Development
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