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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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NUMBER OF BUYERS, DEMAND DETERMINANT

The number of buyers willing and able to buy a good, which is assumed constant when a demand curve is constructed. The number of buyers is one of five demand determinants that shift the demand curve when they change. The other four are buyers' income, buyers' preferences, other prices, and buyers' expectations.

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Today, you are likely to spend a great deal of time strolling through a department store wanting to buy either a wall poster commemorating the moon landing or storage boxes for your winter clothes. Be on the lookout for slightly overweight pizza delivery guys.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
"Anything's possible. You can be told you have a 90% chance or a 50% chance or a 1% chance, but you have to believe, and you have to fight. "

-- Lance Armstrong, cyclist

GARCH
Generalized Autoregressive Conditional Heteroskedasticity
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