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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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AVERAGE PHYSICAL PRODUCT

The quantity of total output produced per unit of a variable input, holding all other inputs fixed. Average physical product, usually abbreviated APP, is found by dividing total physical product by the quantity of the variable input. Average product, which more often goes by the shorter name average product (AP), is one of two measures derived from total physical product. The other is marginal physical product.

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APLS

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Today, you are likely to spend a great deal of time flipping through the yellow pages trying to buy either a green fountain pen or a handcrafted bird house. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
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LRAC
Long Run Average Cost
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