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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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AGGREGATE DEMAND AND MARKET DEMAND

The aggregate demand curve, or AD curve, has similarities to, but differences from, the standard market demand curve. Both are negatively sloped. Both relate price and quantity. However, the market demand curve is negatively sloped because of the income and substitution effects and the aggregate demand curve is negatively sloped because of the real-balance, interest-rate, and net-export effects.

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PINK FADFLY
[What's This?]

Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for jovial bank tellers.
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This isn't me! What am I?

Lombard Street is London's equivalent of New York's Wall Street.
"The greatest use of life is to spend it for something that will outlast it."

-- William James, psychologist

MU
Marginal Utility
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