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LONG-RUN MARGINAL COST CURVE: A graphical representation of the relationship between long-run marginal cost and the quantity of output produced. Like other marginal curves, the long-run marginal cost curve follows the average-marginal rule relative to the long-run average cost curve. In all outward appearance, the long-run marginal cost curve looks very much like the short-run marginal cost, that is, it is U-shaped. However, the U-shape is attributable to returns to scale rather than increasing and decreasing marginal returns.

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TROUGH

The transition of a business-cycle contraction to a business-cycle expansion. The end of a contraction carries this descriptive term of trough, or the lowest level of economic activity reached in recent times. A trough is one of two turning points. The other, the transition from expansion to contraction, is a peak. Turning points are important because they represent the transition from bad to good or good to bad.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius looking to buy either a rechargeable battery for your camera or a coffee cup commemorating the first day of spring. Be on the lookout for defective microphones.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
"There's a very positive relationship between people's ability to accomplish any task and the time they're willing to spend on it."

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KCBT
Kansas City Board of Trade
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