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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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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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PINK FADFLY
[What's This?]

Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for jovial bank tellers.
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This isn't me! What am I?

The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"The greatest use of life is to spend it for something that will outlast it."

-- William James, psychologist

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