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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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SUBSTITUTE GOOD

In general, one of two (or more) goods that are related in an either/or fashion. In terms of demand, substitute goods are those that provide the same basic satisfaction of a want or need when consumed. In terms of supply, substitute goods are those that use the same resource for production in an exclusionary manner. A substitute good is one of two ways that goods are related. The other is a complement good.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites trying to buy either a velvet painting of Elvis Presley or a wall poster commemorating yesterday. Be on the lookout for crowded shopping malls.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"Do what you feel in your heart to be right ‚ for you'll be criticized anyway. You'll be damned if you do and damned if you don't. "

-- Eleanor Roosevelt, first lady

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