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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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LAGGING ECONOMIC INDICATORS

Seven economic statistics that tend to move up or down a few months AFTER business-cycle expansions and contractions. Most importantly, these measures indicate peak and trough turning points about three to twelve months after they occur. Lagging economic indicators are one of three groups of economic measures used to track business-cycle activity. The other two are coincident economic indicators and leading economic indicators.

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Today, you are likely to spend a great deal of time wandering around the downtown area seeking to buy either clothing for your kitty cats or a set of luggage without wheels. Be on the lookout for the last item on a shelf.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
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