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INJECTIONS-LEAKAGES 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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PERFECT COMPETITION, PROFIT MAXIMIZATION

A perfectly competitive firm is presumed to produce the quantity of output that maximizes economic profit--the difference between total revenue and total cost. This production decision can be analyzed directly with economic profit, by identifying the greatest difference between total revenue and total cost, or by the equality between marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius trying to buy either a small, foam rubber football or an instructional DVD on learning to the play the oboe. Be on the lookout for broken fingernail clippers.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"We should never allow ourselves to be bullied by an either-or. There is often the possibility of something better than either of those two alternatives. "

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