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TRADE SURPLUS: Formally termed a balance of trade surplus, a condition in which a nation's exports are greater than imports. In other words, a country is buying less stuff from foreigners than foreigners are buying from domestic producers. A trade surplus is usually thought to be a good thing for a country. However, every country in the world cannot run a trade surplus at the same time. Excessive trade surpluses can also lead to invasion by sizable foreign armies.

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CONCAVE: A curve that is 'bowed-in' toward the origin, like entering a cave. Technically speaking, the slope of a concave curve decreases from left to right as the X-axis variable increases.

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PERFECT COMPETITION, DEMAND

The demand curve for the output produced by a perfectly competitive firm is perfectly elastic at the going market price. The firm can sell all of the output that it wants at this price because it is a relatively small part of the market. As a price taker, the firm has no ability to charge a higher price and no reason to charge a lower one. The market price facing a perfectly competitive firm is also average revenue and, most important, marginal revenue.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club looking to buy either a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or decorative garden figurines. Be on the lookout for pencil sharpeners with an attitude.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
"Defeat is simply a signal to press onward. "

-- Helen Keller, author, lecturer

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