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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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PREFERENCES CHANGE, UTILITY ANALYSIS

A disruption of consumer equilibrium identified with utility analysis caused by changes in the preferences for a good, which likely results in a change in the quantities of the goods consumed. The change in preferences alters the marginal utility-price ratio and forces a reevaluation of the rule of consumer equilibrium.

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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either a remote controlled World War I bi-plane or a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for neighborhood pets, especially belligerent parrots.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"And while the law of competition may be sometimes hard for the individual, it is best for the race, because it ensures the survival of the fittest in every department. "

-- Andrew Carnegie, entrepreneur

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