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MARKET SHARE: The fraction of an industry's total sales accounted for by a single business. In general, market share is a "first-guess" indicator of a firm's market control. If, for example, a company has a market share of 100 percent (that is, a monopoly), then you can rest assured it has a substantial amount of market control. A company with a 25 percent market share has less, but still notable, market control. In fact, when you get right down to the bottom line, the phrase "market share" is only worth mentioning for oligopolistic firms with a significant degree of market control. There really is no market control for a monopolistically competitive firm with a 0.00000001 percent market share.

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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 essentially means that people prefer more to less. The presumption of rational behavior underlies most economic analysis, especially that applied to consumer demand theory.

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Today, you are likely to spend a great deal of time at a dollar discount store seeking to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for telephone calls from long-lost relatives.
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Natural gas has no odor. The smell is added artificially so that leaks can be detected.
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