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RIVAL CONSUMPTION: Consumption of a good by one person imposes a cost on, or prevents consumption of the good by, another person. Some goods, like food, have extremely rival consumption. One person, and only one person, gets the benefit. Other goods, like national defense, have no consumption rivalry, everyone can benefit simultaneously without imposing a cost on others. This is one of the two key characteristics of a good (the other is excludability) that distinguishes between common-property goods, near-public goods, private goods, and public goods.

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AVERAGE PROPENSITY TO SAVE

The proportion of household income that is used for saving. The average propensity to save (abbreviated APS) is really nothing more than average saving. Together with the average propensity to consume, it indicates how a given level of income is divided between consumption and saving. A related saving measure is the marginal propensity to save.

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APLS

PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time wandering around the downtown area seeking to buy either a genuine down-filled snow parka or throw pillows for your living room sofa. Be on the lookout for slightly overweight pizza delivery guys.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"Progress always involves risk. You can't steal second base and keep your foot on first. "

-- Frederick B. Wilcox

GARCH
Generalized Autoregressive Conditional Heteroskedasticity
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