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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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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a T-shirt commemorating next Thursday or a birthday gift for your uncle. Be on the lookout for gnomes hiding in cypress trees.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"Far and away the best prize that life has to offer is the chance to work hard at work worth doing."

-- Theodore Roosevelt, 26th US president

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