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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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DIAMOND-WATER PARADOX

The apparently conflicting and perplexing observation that water, which is more useful than diamonds, has a lower price than diamonds. This paradox was proposed by economists in the 1800s as a means understanding the role utility plays in the demand price of a good by differentiating between total utility and marginal utility.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs looking to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for small children selling products door-to-door.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
"The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as long as we live."

-- Mortimer Adler

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