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TOTAL COST AND MARGINAL COST: A mathematical connection between marginal cost and total cost stating that marginal cost IS the slope of the total cost curve. If the total cost curve has a positive slope (that is, is upward sloping), then marginal cost is positive. Moreover, if the total cost curve has a positive and increasingly steeper slope, then the marginal cost is positive and rising. If the total cost curve has a positive and decreasingly steeper slope, then the marginal cost is positive but falling.

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CHANGE IN AGGREGATE EXPENDITURES

The movement along an aggregate demand curve caused by a change in the price level. A change in aggregate expenditures is ONLY caused by a change in the price level. This is one of two changes related to aggregate demand. The other is a change in aggregate demand. A change in aggregate expenditures is comparable to a change in quantity demanded.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a pleather CD case or a how-to book on fine dining. Be on the lookout for mail order catalogs with hidden messages.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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