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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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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 driving to a factory outlet seeking to buy either a toaster oven that has convection cooking or a birthday gift for your mother. Be on the lookout for celebrities who speak directly to you through your television.
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A half gallon milk jug holds about $50 in pennies.
"The greatest use of life is to spend it for something that will outlast it."

-- William James, psychologist

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