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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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MARGINAL PROPENSITY TO INVEST

The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time looking for a downtown retail store seeking to buy either a case for your designer sunglasses or arch supports for your shoes. Be on the lookout for jovial bank tellers.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"We succeed in enterprises (that) demand the positive qualities we possess, but we excel in those (that) can also make use of our defects. "

-- Alexis de Tocqueville, statesman, author

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American Assocation of Commodity Traders
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