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MC: The abbreviation for marginal cost, which is the change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost indicates how much total cost changes for a give change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (remember total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. Marginal cost is found by dividing the change in total cost (or total variable cost) by the change in output.

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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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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway hoping to buy either a package of 4 by 6 index cards, the ones with lines or a 50 foot extension cord. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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