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MARGINAL REVENUE: The change in total revenue resulting from a change in the quantity of output sold. For a perfectly competitive firm, marginal revenue is equal to price.

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LONG-RUN TOTAL COST

The opportunity cost incurred by all of the factors of production used in the long run (when all inputs are variable) by a firm to produce a good or service, including wages paid to labor, rent paid for the land, interest paid to capital owners, and a normal profit earned by entrepreneurs. Unlike short-run total cost, long-run total cost cannot be separated into fixed cost and variable cost. In the long run, all inputs are variable, so all cost is variable.

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Today, you are likely to spend a great deal of time wandering around the downtown area seeking to buy either a rechargeable flashlight or storage boxes for your computer software CDs. Be on the lookout for small children selling products door-to-door.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"A leader is most successful when people barely know he exists. When his work is done, his aim fulfilled, his troops will feel they did it themselves. "

-- Lao-Tzu, philosopher

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