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U-SHAPED COST CURVES: The family of short-run cost curves consisting of average total cost, average variable cost, and marginal cost, all of which have U-shapes. They are U-shaped because each has high but falling cost at low quantities of output, which then reaches a minimum, then has rising cost at larger quantities of output. Although the average fixed cost curve is not U-shaped, it's occasionally included with the other three just for sake of completeness.

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INTERNATIONAL TRADE

The exchange of goods and services among the nations of the world. Also termed foreign trade when viewed from the perspective of a given country, the international exchange of production is comparable to any exchange, except that buyers and sellers are from different countries. The study of international trade highlights an important economic principle, the law of comparative advantage, which helps to explain not only why nations engage in trade but why individuals engage in trade. A related area of study is international finance, both of which are part of the broader study of international economics.

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Today, you are likely to spend a great deal of time wandering around the downtown area seeking to buy either a weathervane with a horse on top or a case of blank recordable DVDs. 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.
"To understand a man, you must know his memories. The same is true of a nation."

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