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SHUTDOWN RULE: A rule stating that firm minimizes economic loss by producing no output in the short run if price is less than average variable cost. In the short run, a firm incurs total fixed cost whether or not it produces any output. As such, if the market price is falls below average total cost, it must decide if the economic loss from producing the quantity of output that equates marginal revenue and marginal cost is more or less than the economic loss incurred with shutting down production in the short run (which is equal to total fixed cost).

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AGGREGATE EXPENDITURES

The total expenditures on gross domestic product undertaken in a given time period by the four sectors--household, business, government, and foreign. Expenditures made by each of these sectors are commonly termed consumption expenditures, investment expenditures, government purchases, and net exports. Aggregate expenditures (AE) are a cornerstone in the study of macroeconomics, playing critical roles in Keynesian economics, aggregate market analysis, and to a lesser degree, monetarism. In particular, aggregate expenditures are combined with the price level as aggregate demand.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a birthday greeting card for your father or a T-shirt commemorating the first day of spring. Be on the lookout for letters from the Internal Revenue Service.
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Junk bonds are so called because they have a better than 50% chance of default, carrying a Standard & Poor's rating of CC or lower.
"A leader, once convinced that a particular course of action is the right one, must . . . be undaunted when the going gets tough."

-- President Ronald Reagan

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National Bureau of Economic Research
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