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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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PERSONAL INCOME AND NATIONAL INCOME

Personal income (PI) is the total income received by the members of the domestic household sector, which may or may not be earned from productive activities during a given period of time. National income (NI) is the total income earned by the citizens of the national economy resulting from their ownership of resources used in the production, which may or may not be received by members of the household sector. Personal income can be derived from national income by subtracting income earned but not received (IEBNR) and adding income received but not earned (IRBNE).

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Today, you are likely to spend a great deal of time searching the newspaper want ads wanting to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for the happiest person in the room.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"There are two big forces at work, external and internal. We have very little control over external forces such as tornadoes, earthquakes, floods, disasters, illness and pain."

-- Leo Buscaglia, Author

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