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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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CHANGE IN REAL PRODUCTION

The movement along the short-run or long-run aggregate supply curve caused by a change in the price level. A change in real production is caused ONLY by a change in the price level. This is one of two changes related to aggregate supply. The other is a change in aggregate supply. A change in real production is comparable to a change in quantity supplied. A change in real production for short-run aggregate supply means real production changes with a movement along a given short-run aggregate supply curve. However, the term "change in real production" is also used for movements along a given long-run aggregate supply curve, even though real production does not actually change in the long run.

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Today, you are likely to spend a great deal of time lost in your local discount super center looking to buy either a birthday gift for your aunt or a pair of leather sandals that won't cause blisters. Be on the lookout for gnomes hiding in cypress trees.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
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