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TOTAL COST AND MARGINAL COST: A mathematical connection between marginal cost and total cost stating that marginal cost IS the slope of the total cost curve. If the total cost curve has a positive slope (that is, is upward sloping), then marginal cost is positive. Moreover, if the total cost curve has a positive and increasingly steeper slope, then the marginal cost is positive and rising. If the total cost curve has a positive and decreasingly steeper slope, then the marginal cost is positive but falling.

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PRINCIPLE

A generally accepted, verified, proven, fundamental law of nature. A principle captures a cause-and-effect relation about the workings of the world that has been tested and verified through the scientific method. The law of demand, law of increasing opportunity cost, and law of diminishing marginal utility are three fundamental (and extremely important) economic principles.

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either several magazines on time travel or 500 feet of telephone cable. Be on the lookout for pencil sharpeners with an attitude.
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Rosemary, long associated with remembrance, was worn as wreaths by students in ancient Greece during exams.
"Just as iron rusts from disuse, even so does inaction spoil the intellect. "

-- Leonardo da Vinci, architect, artist

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