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UNDERGROUND ECONOMY: Illegal and unreported market transactions and productive activity that escape the watchful eyes of official record keepers. By most estimates, a substantial amount of productive activity takes place in the underground economy for the United States. Of course, these are only estimates because such activity, by definition, goes unreported. Were activity in the underground economy added to official activity in the "overground" economy, then gross domestic product could be boosted by as much as 25% to 50%, or more.

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MARGINAL PRODUCT CURVE

A curve that graphically illustrates the relation between marginal product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the incremental change in output at each level of a variable input. The marginal product curve is one of three related curves used in the analysis of the short-run production of a firm. The other two are total product curve and average product curve. The marginal product curve plays in key role in the economic analysis of short-run production by a firm.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time at a going out of business sale trying to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for the happiest person in the room.
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John Maynard Keynes was born the same year Karl Marx died.
"Courage is the ladder on which all the other virtues mount."

-- Claire Boothe Luce, diplomat, writer

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Long Run Aggregate Supply
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