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GOLD CERTIFICATE: Paper currency issued by the U. S. Treasury from the civil war until 1933 that could be exchanged for an equal value of gold. Gold certificates were used as part of a gold standard. With the exception of collectors, gold certificates have long been out of circulation, replaced first by silver certificates, then in the past few decades by Federal Reserve notes.

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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store seeking to buy either a printer that works with your stockpile of ink cartridges or income tax software. Be on the lookout for jovial bank tellers.
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Woodrow Wilson's portrait adorned the $100,000 bill that was removed from circulation in 1929. Woodrow Wilson was removed from circulation in 1924.
"I much prefer the sharpest criticism of a single intelligent man to the thoughtless approval of the masses."

-- Johannes Kepler, German Astronomer

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