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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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CETERIS PARIBUS

A Latin term meaning that other factors remain unchanged. Ceteris paribus is commonly used as an assumption when conducting a wide variety of economic analyses. By holding everything else constant, the ceteris paribus assumption makes it possible to identify the cause-and-effect relation between two factors. Relaxing the ceteris paribus assumption is the primary analytical technique used in the comparative statics study of economics.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either a T-shirt commemorating yesterday or a pair of handcrafted oven mitts. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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