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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 of a good or service, including wages paid to labor, rent paid for the land, interest paid to capital owners, and a normal profit paid to entrepreneurs. Unlike short-run total cost, long-run total cost can not 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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DECREASING MARGINAL RETURNS

In the short-run production of a firm, an increase in the variable input results in a decrease in the marginal product of the variable input. Decreasing marginal returns typically surface after the first few quantities of a variable input are added to a fixed input. This is one of two types of marginal returns. The other is increasing marginal returns. A related phenomenon is diseconomies of scale associated with long-run production.

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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.
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