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IMPERFECT COMPETITION: Any markets or industries that do not match the criteria for perfect competition. The key characteristics of perfect competition are: (1) a 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. These four characteristics are essentially impossible to match in the real world.

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ADVERSE SELECTION

An inefficient, bad, or adverse outcome of a market exchange that results because buyers and/or sellers make decisions based on asymmetric information. This commonly results in a market that exchanges a lesser quality good, what is termed the market for lemons. Two related problems resulting from asymmetric information are moral hazard and the principal-agent problem. Two methods of lessoning the problem of adverse selection are signalling and screening.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a genuine down-filled comforter or a 200-foot blue garden hose. Be on the lookout for crowded shopping malls.
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Lombard Street is London's equivalent of New York's Wall Street.
"Be a yardstick of quality. Some people aren't used to an environment where excellence is expected. "

-- Steve Jobs, Apple Computer co-founder

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