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OLIGOPOLY: A market structure dominated by a small number of large firms, selling either identical or differentiated products, and significant barriers to entry into the industry. This is one of four basic market structures. The other three are perfect competition, monopoly, and monopolistic competition.

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AGGREGATE SUPPLY DECREASE, SHORT-RUN AGGREGATE MARKET

A shock to the short-run aggregate market caused by a decrease in aggregate supply, resulting in and illustrated by a leftward shift of the short-run aggregate supply curve. A decrease in aggregate supply in the short-run aggregate market results in an increase in the price level and a decrease in real production. The level of real production resulting from the shock can be greater or less than full-employment real production.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway wanting to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for rusty deck screws.
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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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