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SDR: The abbreviation for Special Drawing Rights, which is a system of accounts nations have with International Monetary Fund that are used to settle any balance of payments deficits. In essence, SDRs are simply an international currency that makes it easier to conduct all sorts of international transactions. In decades past, when gold was used as the primary international currency, any balance of payments deficits was paid with gold. However, in 1967 this system of SDRs was established in lieu of sending gold all over the globe.

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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 looking for the new strip mall out on the highway seeking to buy either a remote controlled train set or a genuine down-filled snow parka. Be on the lookout for the last item on a shelf.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Posterity: you will never know how much it has cost my generation to preserve your freedom. I hope you will make good use of it. "

-- John Quincy Adams, 6th U. S. president

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