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RATIONAL BEHAVIOR: The notion that people make decisions based on the desire to obtain the greatest amount of satisfaction. Rational behavior essential means that people prefer more to less. The presumption of rational behavior underlies most economic analyses, especially those applied to consumer demand theory.

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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 going out of business sale hoping to buy either an AC adapter that won't fry your computer or a case for your designer sunglasses. Be on the lookout for pencil sharpeners with an attitude.
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