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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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LEAKAGES LINE

A graphical representation of the relation between the level of aggregate production and one or more leakages. The three leakages (non-consumption uses of the income generated from aggregate production) are saving, taxes, and imports. The leakages line sequentially adds, or layers, each of these three uses of income depending on the number of sectors used in the analysis (two, three, or four). The slope of the leakages line depends on which if any of the uses of income are induced by aggregate production. The leakages line is combined with the injections line (containing investment expenditures, government purchases, and exports) in the Keynesian injections-leakages model.

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APLS

GREEN LOGIGUIN
[What's This?]

Today, you are likely to spend a great deal of time calling an endless list of 800 numbers seeking to buy either a rechargeable battery for your camera or a coffee cup commemorating the first day of spring. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"The way employees treat customers reflects the manner in which they're treated by management. "

-- James Perkins, president, Cornell University

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Economic Journal
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