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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 REVENUE PRODUCT

The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input or by multiplying marginal physical product by marginal revenue. This is also termed value of the marginal product. Marginal revenue product is a key concept for understanding the demand for productive inputs.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors hoping to buy either handcrafted decorations to hang on your walls or throw pillows for your bed. Be on the lookout for jovial bank tellers.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"When I stand before God at the end of my life, I would hope that I would not have a single bit of talent left, and could say, „I used everything you gave me.¾"

-- Erma Bombeck, writer

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