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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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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 searching for rummage sales looking to buy either a case for your designer sunglasses or arch supports for your shoes. Be on the lookout for slow moving vehicles with darkened windows.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"How wonderful it is that nobody need wait a single moment before starting to improve the world."

-- Anne Frank

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