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MARGINAL REVENUE: The change in total revenue resulting from a change in the quantity of output sold. For a perfectly competitive firm, marginal revenue is equal to price.

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FACTOR MARKET, EFFICIENCY

A factor market achieves efficiency in the allocation of resources by equating marginal revenue product to factor price. Perfect competition, as the efficiency benchmark, is the only market structure to satisfy this criterion and achieve factor market efficiency. Monopsony, oligopsony, and monopsonistic competition are inefficient because they equate marginal revenue product to marginal factor cost, both of which are greater than factor price.

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Today, you are likely to spend a great deal of time surfing the Internet trying to buy either a birthday gift for your aunt or a pair of leather sandals that won't cause blisters. Be on the lookout for pencil sharpeners with an attitude.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"The majority of men meet with failure because of their lack of persistence in creating new plans to take the place of those that fail. "

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