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HERFINDAHL-HIRSHMAN 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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GAME THEORY

An analysis that illustrates how the choices between two players affect the outcomes of a "game." Game theory is commonly used to explain the behavior and decision making of oligopolistic firms. It illustrates that cooperation, rather competition, between two "players" can lead to an outcome that is more beneficial to both players.

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Today, you are likely to spend a great deal of time wandering around the shopping mall looking to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for malfunctioning pocket calculators.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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