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SPATIAL: A modifying term used to indicate a connection or relation to space, and by inference the study of urban and regional economics, as suggested by the term spatial differentiation (which means differences in the concentration of economic activity across space). This term is commonly used to make people some exceedingly intelligent by asking questions like "Did you consider spatial factors in your analysis?" However, in so doing be careful that the word is pronounced "spatial", not "special." This just confuses the situation.

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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 wandering around the downtown area trying to buy either a case for your designer sunglasses or arch supports for your shoes. Be on the lookout for the last item on a shelf.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"As is our confidence, so is our capacity. "

-- William Hazlitt, essayist

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