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MARGINAL PHYSICAL PRODUCT: The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal physical product, usually abbreviated MPP, is found by dividing the change in total product by the change in the variable input. Marginal physical product usually goes by the shorter name marginal product.

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DISPOSABLE INCOME

The total income that can be used by the household sector for either consumption expenditures or saving during a given period of time, usually one year. Disposable income (DI) is one of three measures of income reported in the National Income and Product Accounts maintained by the Bureau of Economic Analysis. The other two are national income (NI) and personal income (PI). Two related measures of production are gross domestic product (GDP) and net domestic product (NDP).

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Today, you are likely to spend a great deal of time lost in your local discount super center hoping to buy either a wall poster commemorating the first day of spring or a lazy Susan for you dining room table. Be on the lookout for mail order catalogs with hidden messages.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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GARCH
Generalized Autoregressive Conditional Heteroskedasticity
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