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TOTAL-MARGINAL RULE: A mathematical connection between a marginal value is the slope of a curve of the corresponding total value stating that the marginal IS the slope of the total curve. If the total curve has a positive slope (that is, is upward sloping), then marginal is positive. If the total product has a negative slope (downward sloping), then marginal is negative. If the total curve has a zero slope (horizontal), then marginal is zero. Moreover, if the total curve has an increasing slope (becoming steeper), then the marginal is rising. If the total curve has a decreasing slope (becoming flatter), then the marginal is falling.

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PROFIT

Generally speaking, the difference between revenue received by a firm for production and cost incurred in the production, or the excess of revenue over cost. Three specific notions of profit exist, each with a different meaning. Accounting profit is the difference between revenue and accounting cost. Economic profit is the difference between revenue and total opportunity cost. Normal profit is opportunity cost of entrepreneurship. Profit is occasionally used synonymously with the term rent, or economic rent.

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Today, you are likely to spend a great deal of time watching infomercials looking to buy either a case for your designer sunglasses or arch supports for your shoes. Be on the lookout for mail order catalogs with hidden messages.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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