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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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ASSUMPTIONS, PRODUCTION POSSIBILITIES

The four key assumptions underlying production possibilities analysis are: (1) resources are used to produce one or both of only two goods, (2) the quantities of the resources do not change, (3) technology and production techniques do not change, and (4) resources are used in a technically efficient way.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time at a garage sale looking to buy either throw pillows for your living room sofa or a hepa filter for your furnace. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
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