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MARGINAL PRODUCTIVITY THEORY: A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of its output. Marginal productivity theory indicates that the demand for a factor of production input is based on the marginal product of the factor and the price of the output produced by the factor.

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CLOSED ECONOMY

An economy that does not engage in international trade or other forms of interaction with other countries. That is, a closed economy neither exports goods and services to, nor imports goods and services from, other economies that make up its foreign sector. It is "closed" to the flow of goods and services into or out of the country. The alternative to a closed economy is an open economy, one that does engage in international trade.

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APLS

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Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for infected paper cuts.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"Always vote for principle, though you may vote alone, and you may cherish the sweetest reflection that your vote is never lost. "

-- John Quincy Adams, 6th US president

JHR
Journal of Human Resources
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