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MARGINAL REVENUE PRODUCT: The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input. This is also termed value of the marginal product. Marginal revenue product is a key component for understanding the demand for productive inputs (that is, factor demand).

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SILVER CERTIFICATES

Paper currency issued and authorized by the U.S. Department of the Treasury that is, in principle, backed up by, and exchangeable for, an equivalent value of silver. Silver certificates were in circulation as a medium of exchange for the U.S. economy during two periods, 1878 to 1923 and 1928 to 1957. A similar form of paper currency is gold certificates.

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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a birthday greeting card for your mother that doesn't look like a greeting card or a handcrafted spice rack. Be on the lookout for pencil sharpeners with an attitude.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"There is a way to look at the past. Don't hide from it. It will not catch you - if you don't repeat it."

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