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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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TOTAL REVENUE, MONOPOLISTIC COMPETITION

The revenue received by a monopolistically competitive firm for the sale of its output. Total revenue is one two bits of information a monopolistically competitive firm needs to calculate economic profit, the other is total cost. In general, total revenue is the price times quantity--the price received for selling a good times the quantity of the good sold at that price. For a monopolistically competitive firm, which has a modest degree of market control, total revenue increases at a decreasing rate. Two other revenue measures directly related to total cost are average revenue and marginal revenue. Total revenue is often depicted as a total revenue curve.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors seeking to buy either a combination CD player, clock radio, and telephone (with answering machine) or a revolving spice rack. Be on the lookout for slow moving vehicles with darkened windows.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"The roots of education are bitter, but the fruit is sweet."

-- Aristotle

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