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PERFECT COMPETITION, REALISM: Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to one or two of the four key characteristics of perfect competition, none matches all four sufficiently that they can be declared PERFECTLY competitively. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.
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RISK AVERSION A preference for risk in which a person prefers guaranteed or certain income over risky income. Risk aversion arises due to decreasing marginal utility of income. A risk averse person prefers to avoid risk and is willing to pay to do so, often through the purchase of insurance. This is one of three risk preferences. The other two are risk neutrality and risk loving.
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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!
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"Love looks through a telescope; envy, through a microscope. " -- Josh Billings, humorist
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JE
Journal of Econometrics
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