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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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NONPAYER EXCLUDABILITY

Whether or not nonpayers can be excluded from consuming a good. In other words, can those who do not pay for a good be excluded from consuming the good. Nonpayer excludability is based on the ability to possess and transfer property rights or ownership of a good. For some goods, nonpayers can be easily excluded from consumption because property rights are well-defined and easily controlled. For other goods nonpayers cannot be easily excluded from consumption because property rights are not well-defined and cannot be easily controlled. When combined with consumption rivalry, the result is four alternative types of goods -- private, public, common-property, and near-public.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway trying to buy either throw pillows for your bed or a package of blank rewritable CDs. Be on the lookout for slightly overweight pizza delivery guys.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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