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MARGINAL COST: The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost indicates how much total cost changes for a give change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (remember total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. Marginal cost, usually abbreviated MC, is found by dividing the change in total cost (or total variable cost) by the change in output.
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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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ORANGE REBELOON
[What's This?]
Today, you are likely to spend a great deal of time strolling through a department store hoping to buy either a replacement battery for your pocket calculator or a how-to book on home remodeling. Be on the lookout for telephone calls from former employers.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
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"How we spend our days is, of course, how we spend our lives. " -- Annie Dillard, essayist
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JGB
Japanese Government Bond
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