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BENEFIT-COST ANALYSIS: An analytical technique that compares the benefit generated by an activity with its opportunity cost of production. The rule is that if benefits exceed costs, then the activity is efficient and should be undertaken. In some cases the end result of benefit-cost analysis is net benefits, which is benefits minus cost. A positive value means the activity is efficient. In other cases the end result of benefit-cost analysis is a benefit-cost ratio, which is benefits divided by costs. A ratio greater than 1.0 is thus the indication of an efficient activity.

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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 at a dollar discount store looking to buy either a birthday gift for your father that doesn't look like every other birthday gift for your father or a green fountain pen. Be on the lookout for crowded shopping malls.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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IROR
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