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GRESHAM'S LAW: A principle stating that bad money drives good money out of circulation. For this law to apply an economy clearly needs two types of money, one considered good and the other considered bad. Good and bad money in this context has nothing to do with the propensity to torture small animals or attempts at world domination. Good and bad are based on the official value in exchange versus value in use. Gold and silver, which were both used as money in the U.S. Economy in the 1800s, provides an illustration. Silver took on the role of "bad money" because it was relatively less value in use than gold. As such, people used silver as everyday money and stockpiled, or hoarded, gold. The silver bad money drove the gold good money out of circulation.

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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time searching for rummage sales hoping to buy either galvanized steel storage shelves or a large green chalkboard shaped like the state of Maine. Be on the lookout for small children selling products door-to-door.
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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.
"The secret of getting things done is to act! "

-- Dante Alighieri, poet

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