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MARKET FAILURE: A condition in which a market does not efficiently allocate resources to achieve the greatest possible consumer satisfaction. The four main market failures are--(1) public good, (2) market control, (3) externality, and (4) imperfect information. In each case, a market acting without any government imposed direction, does not direct an efficient amount of our resources into the production, distribution, or consumption of the good.

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MARGINAL PHYSICAL PRODUCT

The change in the quantity of total physical product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal physical product, usually abbreviated MPP, is found by dividing the change in total physical product by the change in the variable input. Marginal physical product, which more often goes by the name marginal product (MP), is one of two measures derived from total physical product. The other is average physical product.

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Today, you are likely to spend a great deal of time at a crowded estate auction seeking to buy either a printer that works with your stockpile of ink cartridges or income tax software. Be on the lookout for pencil sharpeners with an attitude.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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