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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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DEADWEIGHT LOSS

The decrease in the sum of consumer surplus and producer surplus that results from the imposition of a tax. When a tax drives a wedge between demand price and supply price it disrupts what otherwise would be an efficient market equilibrium. Inefficiency arises because while a portion of the sum of consumer and producer surplus is merely transferred to government, a portion of this sum also disappears. The part that disappears is the deadweight loss and is an indicator of the inefficiency of the tax.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a lighted magnifying glass or a small, foam rubber football. Be on the lookout for small children selling products door-to-door.
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