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OPEN ECONOMY: An economy with a great deal of foreign trade. At the extreme, a completely open economy is one that has no trade barriers. Most of the world's hundred-plus nations are relatively open, but much less than they could be because of a wide assortment of trade restrictions. The more an economy is open, the more dependent it is on happenings around the world.

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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 output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time watching the shopping channel looking to buy either a three-hole paper punch or decorative picture frames. Be on the lookout for door-to-door salesmen.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
"Give the American people a good cause, and there's nothing they can't lick. "

-- John Wayne, actor

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