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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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KINKED-DEMAND CURVE

A demand curve with two distinct segments which have different elasticities that join to form a corner or kink. The primary use of the kinked-demand curve is to explain price rigidity in oligopoly. The two segments are: (1) a relatively more elastic segment for price increases and (2) a relatively less elastic segment for price decreases. The relative elasticities of these two segments is based on the interdependent decision-making of oligopolistic firms.

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Today, you are likely to spend a great deal of time searching for rummage sales looking to buy either a coffee cup commemorating last Friday (you know why) or a wall poster commemorating the first day of spring. Be on the lookout for strangers with large satchels of used undergarments.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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