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PRESENT VALUE: The amount of money today that, after interest is added, would have the same value as an amount some time in the future. For example, $100 today, given a 10 percent interest rate, would have a value of $110 in one year ($100 plus $10 in interest). Conversely, $110 in one year, given a 10 percent interest rate, would be equivalent to $100 today. The process of translating a future payment into its present value, such an amount to be received when a bond reaches its date of maturity, is often termed discounting.

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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 touring the new suburban shopping complex looking to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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