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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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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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Today, you are likely to spend a great deal of time watching the shopping channel trying to buy either a remote controlled train set or a genuine down-filled snow parka. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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