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CHANGE IN SUPPLY: A shift of the supply curve caused by a change in one of the supply determinants. In essence, a change in supply is caused by any factor affecting supply EXCEPT price. This concept should be contrasted directly with a change in quantity supplied. You should also review the terms change in quantity demanded and change in demand, too. A change in supply is a change in ALL supply price-quantity supplied pairs, meaning that each price is matched up with a different quantity (which is illustrated as a shift of the supply curve). And this change in supply is caused by a change in any of the supply determinants. In contrast, a change in quantity supplied is a change from one price-quantity pair to the another (which is illustrated as a movement along a given supply curve).

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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 is 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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Today, you are likely to spend a great deal of time at an auction hoping to buy either any book written by Stephan King or a T-shirt commemorating next Thursday. Be on the lookout for crowded shopping malls.
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During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
"No man, for any considerable time, can wear one face to himself and another to the multitude without finally getting bewildered as to which may be true."

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