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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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STORE OF VALUE

The money function in which money is used as a means of postponing the satisfaction obtained from using or consuming goods until a later time. Value is obtained from a good when it is consumed, when it is used to satisfy wants and needs. The value from consuming goods can be stored in several different ways, one of which is money. This is one of four basic functions of money. The other three are medium of exchange, unit of account, and standard of deferred payment.

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Today, you are likely to spend a great deal of time wandering around the shopping mall wanting to buy either a revolving spice rack or a how-to book on home repairs. Be on the lookout for door-to-door salesmen.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"The greatest use of life is to spend it for something that will outlast it."

-- William James, psychologist

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