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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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MARGINAL UTILITY

The additional utility obtained from the consumption or use of an additional unit of a good. It is specified as the change in total utility divided by the change in quantity. Marginal utility indicates what each additional unit of a good is worth to a consumer and provides a theoretical basis for understanding market demand and the law of demand. Marginal utility generally declines with increased consumption of a good, a reflection of the law of diminishing marginal utility.

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Today, you are likely to spend a great deal of time at a crowded estate auction looking to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for neighborhood pets, especially belligerent parrots.
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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!
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