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PERFECT COMPETITION: An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that's not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

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PHYSICAL WEALTH, AGGREGATE EXPENDITURES DETERMINANT

One of several specific aggregate expenditures determinants assumed constant when the aggregate expenditures line is constructed, and that shifts the aggregate expenditures line when it changes. A decrease in physical wealth causes an increase (upward shift) of the aggregate expenditures line. An increase in physical wealth causes a decrease (downward shift) of the aggregate expenditures line. Other notable aggregate expenditures determinants include consumer confidence, federal deficit, inflationary expectations, and exchange rates.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time at a crowded estate auction wanting to buy either a replacement washer for your kitchen faucet or a stretchable, flexible watch band. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Education is the ability to listen to almost anything without losing your temper or your self-confidence. "

-- Robert Frost

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