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TOTAL COST AND MARGINAL COST: A mathematical connection between marginal cost and total cost stating that marginal cost IS the slope of the total cost curve. If the total cost curve has a positive slope (that is, is upward sloping), then marginal cost is positive. Moreover, if the total cost curve has a positive and increasingly steeper slope, then the marginal cost is positive and rising. If the total cost curve has a positive and decreasingly steeper slope, then the marginal cost is positive but falling.

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PERFECT COMPETITION, SHUTDOWN

A perfectly competitive firm is presumed to shutdown production and produce no output in the short run, if price is less than average variable cost. This is one of three short-run production alternatives facing a firm. The other two are profit maximization (if price exceeds average total cost) and loss minimization (if price is greater than average variable cost but less than average total cost).

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time watching the shopping channel wanting to buy either a wall poster commemorating the first day of spring or a lazy Susan for you dining room table. Be on the lookout for defective microphones.
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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
"I don't subscribe to the thesis, 'Let the buyer beware,' I prefer the disregarded one that goes, 'Let the seller be honest.'"

-- Isaac Asimov, Author

ARIMA
Autoregressive Integrated Moving Average
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