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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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OPEN ECONOMY

An economy that engages in international trade, especially one that exports goods and services to, and imports goods and services from, other economies that make up its foreign sector. It is "open" in the sense that goods and services flow into and out of the country. The alternative to an open economy is a closed economy, one that does not engage in international trade.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius hoping to buy either a birthday greeting card for your aunt or a wall poster commemorating the moon landing. Be on the lookout for the happiest person in the room.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"He who has begun has half done. Dare to be wise ‚ begin! "

-- Horace, poet, satirist

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