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KALDOR-HICKS EFFICIENCY: A type of efficiency that results if the monetary value of society's resources are maximized. This is achieved if the marginal willingness to pay by those who benefit from an action is equal to the marginal willingness to accept of those harmed. If this condition is not achieved, then a Kaldor-Hicks improvement is possible. Kaldor-Hicks efficiency, named after Nicholas Kaldor and John Hicks, is the theoretical basis of benefit-cost analysis, a technique commonly used to evaluate the desirability of producing public goods (such as parks, highways, or reservoirs). This is one of two noted efficiency criteria used in economics. The other is Pareto efficiency.

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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 visiting every yard sale in a 30-mile radius looking to buy either a birthday gift for your uncle or a pair of red and purple designer socks. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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