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INJECTION-LEAKAGE MODEL: A model used in Keynesian economics based on the equality of non-consumption expenditures (or injections) and non-consumption uses of income (leakages). On one side of the equality is saving, taxes, and imports -- the non-consumption leakages. On the other side of the equality is investment, government purchases, and exports -- the non-consumption injections. The injection-leakage model provides an alternative to the Keynesian cross for identifying equilibrium aggregate output.

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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. This relation between total cost and marginal cost is also seen with total variable cost. The slope of the total variable cost curve is marginal cost, as well. The relation between total cost and marginal cost is but another in the long line of applications of the total-marginal relation.

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Today, you are likely to spend a great deal of time driving to a factory outlet trying to buy either a how-to book on fixing your computer, with illustrations or several magazines on computer software. Be on the lookout for the happiest person in the room.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as long as we live."

-- Mortimer Adler

QJE
Quarterly Journal of Economics
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