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MARKET FAILURES: Conditions in which a market does not efficiently allocate resources to achieve the greatest possible consumer satisfaction. The four main market failures are--(1) public good, (2) market control, (3) externality, and (4) imperfect information. In each case, a market acting without any government imposed direction, does not direct an efficient amount of our resources into the production, distribution, or consumption of the good.

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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 wandering around the shopping mall seeking to buy either clothing for your pet iguana or a set of hubcaps. Be on the lookout for vindictive digital clocks with revenge on their minds.
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Rosemary, long associated with remembrance, was worn as wreaths by students in ancient Greece during exams.
"In the long run men hit only what they aim at. "

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