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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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PERFECT COMPETITION, CHARACTERISTICS

The four key characteristics of perfect competition are: (1) a large number of small firms, (2) identical products sold by all firms, (3) perfect resource mobility or the freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store trying to buy either decorative picture frames or storage boxes for your income tax returns. Be on the lookout for jovial bank tellers.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"Old minds are like old horses; you must exercise them if you wish to keep them in working order. "

-- John Adams, 2nd US president

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