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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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ELASTIC

The general relation between two variables in which relatively small changes in one variable (A) cause relatively large changes in another variable (B). Small changes in variable A cause relatively large changes in variable B or the percentage change in variable B is larger than the percentage change in variable A. This characterization of elasticity is most important for the price elasticity of demand and the price elasticity of supply. Elastic is one of two general elasticity relations between two variables. The other is inelastic.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers trying to buy either a solid oak entertainment center or a remote controlled ceiling fan. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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