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BLACK MARKET: An illegal market in which the price of the goods sold is above a legally set maximum price. A black market invariable results whenever the government imposes a price ceiling on a good. A common example of a price ceiling is rent controls on apartments in many large cities. Although landlords cannot "legally" rent apartments for more than the specified maximum, they often do so "illegally" by charging "finders fees" and "tenant association dues." In so doing, they have entered into the realm of black markets.

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AVERAGE-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding average value stating that the change in the average value depends on a comparison between the average and the marginal. This mathematical relation between average and marginal surfaces throughout the study of economics, especially production (average product and marginal product), cost (average total cost and marginal cost), and revenue (average revenue and marginal revenue). A similar relation is that between a total value and the corresponding marginal value.

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Today, you are likely to spend a great deal of time watching infomercials looking to buy either a genuine down-filled pillow or one of those "hang in there" kitty cat posters. Be on the lookout for attractive cable television service repair people.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"Give the American people a good cause, and there's nothing they can't lick. "

-- John Wayne, actor

QJE
Quarterly Journal of Economics
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