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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 AGGREGATE DEMAND

A shift of the aggregate demand curve caused by a change in one of the aggregate demand determinants. A change in aggregate demand is caused by any factor affecting aggregate demand EXCEPT the price level. This is one of two changes related to aggregate demand. The other is a change in aggregate expenditures. A change in aggregate demand is comparable to a change in market demand.

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Today, you are likely to spend a great deal of time at a dollar discount store seeking to buy either a green and yellow striped sweater vest or a Boston Red Sox baseball cap. Be on the lookout for slow moving vehicles with darkened windows.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
"An organization's ability to learn, and translate that learning into action rapidly, is the ultimate competitive business advantage. "

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