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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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AGGREGATE SUPPLY DETERMINANTS

An assortment of ceteris paribus factors that affect short-run and long-run aggregate supply, but which are assumed constant when the short-run and long-run aggregate supply curves are constructed. Changes in any of the aggregate supply determinants cause the short-run and/or long-run aggregate supply curves to shift. While a wide variety of specific ceteris paribus factors can cause the aggregate supply curves to shift, they are commonly grouped into three broad categories--resource quantity, resource quality, and resource price.

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Today, you are likely to spend a great deal of time at a crowded estate auction looking to buy either a wall poster commemorating the 2000 Presidential election or a rechargeable flashlight. Be on the lookout for telephone calls from long-lost relatives.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
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