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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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CONSUMER CONFIDENCE, AGGREGATE EXPENDITURES DETERMINANT

One of several specific aggregate expenditures determinants assumed constant when the aggregate expenditures line is constructed, and that shifts the aggregate expenditures line when it changes. An increase in consumer confidence causes an increase (upward shift) of the aggregate expenditures line. A decrease in consumer confidence causes a decrease (downward shift) of the aggregate expenditures line. Other notable aggregate expenditures determinants include interest rates, federal deficit, inflationary expectations, and exchange rates.

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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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