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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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FALLACY OF COMPOSITION

The logical fallacy of arguing that what is true for the parts is also true for the whole. In the study of economics, this takes the form of assuming that what works for parts of the economy, such as households or businesses, also works for the aggregate, or macroeconomy. The contrasting fallacy is the fallacy of division.

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Today, you are likely to spend a great deal of time at an auction trying to buy either a stretchable, flexible watch band or high-gloss photo paper that works with your printer. Be on the lookout for broken fingernail clippers.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
"When one door closes another door opens; but we do often look so long and so regretfully upon the closed door, that we do not see the ones which open for us. "

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