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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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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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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius seeking to buy either a decorative windchime with plastic or a flower arrangement for that special day for your mother. Be on the lookout for neighborhood pets, especially belligerent parrots.
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This isn't me! What am I?

Al Capone's business card said he was a used furniture dealer.
"The shifts of fortune test the reliability of friends. "

-- Marcus Tullius Cicero, Roman statesman

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Bank for International Settlements
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