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EXCHANGE RATES, AGGREGATE DEMAND DETERMINANT: One of several specific aggregate demand determinants assumed constant when the aggregate demand curve is constructed, and that shifts the aggregate demand curve when it changes. An increase in exchanges rates causes an increase (rightward shift) of the aggregate curve. A decrease in the exchanges rates causes a decrease (leftward shift) of the aggregate curve. Other notable aggregate demand determinants include interest rates, the money supply, inflationary expectations, consumer confidence, and the federal deficit.

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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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RED AGGRESSERINE
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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 trying to buy either a pair of red and purple designer socks or a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for small children selling products door-to-door.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
"Live in such a way that you would not be ashamed to sell your parrot to the town gossip."

-- Will Rogers

LRAC
Long Run Average Cost
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