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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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INDUSTRY

A group of firms producing goods or services that are close substitutes-in-consumption. The similarity of the products makes it possible to analyze the production in a market framework. An industry can be broadly defined, such as the manufacturing industry, or narrowly specified, such as the root beer industry. For most economic analysis the term industry is used interchangeably with the term market.

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Today, you are likely to spend a great deal of time flipping through the yellow pages wanting to buy either hand lotion, a big bottle of hand lotion or a lighted magnifying glass. Be on the lookout for broken fingernail clippers.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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-- Virgil, Roman poet

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