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LONG-RUN MARGINAL COST CURVE: A graphical representation of the relationship between long-run marginal cost and the quantity of output produced. Like other marginal curves, the long-run marginal cost curve follows the average-marginal rule relative to the long-run average cost curve. In all outward appearance, the long-run marginal cost curve looks very much like the short-run marginal cost, that is, it is U-shaped. However, the U-shape is attributable to returns to scale rather than increasing and decreasing marginal returns.

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MONOPOLISTIC COMPETITION, LONG-RUN ADJUSTMENT

A monopolistically competitive industry undertakes a two-part adjustment to equilibrium in the long run. One is the adjustment of each monopolistically competitive firm to the appropriate factory size that maximizes long-run profit. The other is the entry of firms into the industry or exit of firms out of the industry, to eliminate economic profit or economic loss. The end result of this long-run adjustment is two equilibrium conditions--one for profit maximization, the other for zero economic profit.

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Today, you are likely to spend a great deal of time driving to a factory outlet looking to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for defective microphones.
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John Maynard Keynes was born the same year Karl Marx died.
"Difficulty is the excuse history never accepts. "

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Weak Law of Large Numbers
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