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AD-AS MODEL: An economic model relating the price level and real production that is used to analyze business cycles, gross domestic product, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The AS-AD model, inspired by the standard market model, captures the interaction between aggregate demand (the buyers) and short-run and long-run aggregate supply (the sellers).

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MARGINAL COST

The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost (MC) indicates how much total cost changes for a given change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. It is found by dividing the change in total cost (or total variable cost) by the change in output. Marginal cost is one of four cost concepts used in short-run production analysis. The other three are average total cost, average fixed cost, and average variable cost.

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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway looking to buy either a T-shirt commemorating the first day of winter or software that won't crash your computer. Be on the lookout for pencil sharpeners with an attitude.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Every time you win, it diminishes the fear a little bit. You never really cancel the fear of losing; you keep challenging it. "

-- Arthur Ashe, tennis player

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