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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 REVENUE PRODUCT AND FACTOR DEMAND

A perfectly competitive firm's factor demand curve is that negatively-sloped portion of its marginal revenue product curve. A perfectly competitive firm maximizes profit by hiring the quantity of input that equates factor price and marginal revenue product. As such, the firm moves along its negatively-sloped marginal revenue product curve in response to changing factor prices.

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Today, you are likely to spend a great deal of time strolling through a department store wanting to buy either a T-shirt commemorating the first day of winter or software that won't crash your computer. Be on the lookout for slow moving vehicles with darkened windows.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"The secret of getting ahead is getting started. The secret of getting started is breaking your complex, overwhelming tasks into small manageable tasks, and then starting on the first one. "

-- Mark Twain, writer

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