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MARGINAL COST: 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, usually abbreviated MC, 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 visiting every yard sale in a 30-mile radius wanting to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for cardboard boxes.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"Plans are only good intentions unless they immediately degenerate into hard work."

-- Peter Drucker, management consultant

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