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PERFECT COMPETITION AND EFFICIENCY: Perfect competition is the idealized market structure that achieves an efficient allocation of resources. The conditions of perfect competition, including (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology, ensure that perfect competition efficiently allocates resources. This is in fact the purpose of perfect competition: a market structure that illustrates perfection, the best of all possible resource allocation worlds. The real world falls short of this perfection.

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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 the newspaper want ads hoping to buy either a microwave over that won't burn your popcorn or a T-shirt commemorating the first day of winter. Be on the lookout for vindictive digital clocks with revenge on their minds.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
"Long-range goals keep you from being frustrated by short-term failures "

-- J. C. Penney, Retailer

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