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MARKET STRUCTURE: The manner in which a market is organized, based largely on the number of firms in the industry. The four basic market structure models are: perfect competition, monopoly, monopolistic competition, and oligopoly. The primary difference between each is the number of firms on the supply side of a market. Both perfect competition and monopolistic competition have a large number of relatively small firms selling output. Oligopoly has a small number of relatively large firms. And monopoly has a single firm.

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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 waiting for visits from door-to-door solicitors hoping to buy either a rechargeable battery for your cell phone or a T-shirt commemorating the 2000 Olympics. Be on the lookout for telephone calls from long-lost relatives.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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