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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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PRODUCT INNOVATION

An innovation of a new product, technology, or idea that generates a beneficial improvement in society and the economy; one that is fundamentally different from existing products, technologies, or ideas. The contrast is with a process innovation, which is an improvement in an existing product, technology, or idea.

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Today, you are likely to spend a great deal of time wandering around the downtown area trying to buy either an AC adapter that works with your MPG player or rechargeable batteries. Be on the lookout for poorly written technical manuals.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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