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PRICE CEILING: A legally established maximum price. The government is occasionally inclined to keep the price of one good or another from rising too high. Examples include apartments, gasoline, and natural gas. While the goal is invariably a noble one--like keeping stuff affordable for poor people--a price ceiling often does more harm than good. First, it usually creates a shortage, meaning that many of the buyers who being protected against high prices, can't even buy the good. Second, as a consequence of this shortage, a price ceiling is likely to generate a black market where the good is sold illegally above the price ceiling.

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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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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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