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AMEX: The common abbreviation for the American Stock Exchange, which is one of three national stock markets in the United States (see National Association of Securities Dealers and New York Stock Exchange) that trade ownership shares in corporations. In terms of daily stock transactions and the number of stocks listed, the American Stock Exchange is the smallest of these three. However, it's composite index of stock prices -- AMEX is considered important enough to be flashed briefly on the nightly news.

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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 (MC) indicates how much total cost changes for a given change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. It is found by dividing the change in total cost (or total variable cost) by the change in output. Marginal cost is one of four cost concepts used in short-run production analysis. The other three are average total cost, average fixed cost, and average variable cost.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors looking to buy either a printer that works with your stockpile of ink cartridges or income tax software. Be on the lookout for poorly written technical manuals.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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AMEX
American Stock Exchange
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