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MARGINAL COST AND DIMINISHING MARGINAL RETURNS: Decreasing then increasing marginal cost that gives rise to a U-shaped marginal cost curve reflects increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of production in the short run.

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ASSUMPTIONS, KEYNESIAN ECONOMICS

The macroeconomic study of Keynesian economics relies on three key assumptions--rigid prices, effective demand, and savings-investment determinants. First, rigid or inflexible prices prevent some markets from achieving equilibrium in the short run. Second, effective demand means that consumption expenditures are based on actual income, not full employment or equilibrium income. Lastly, important savings and investment determinants include income, expectations, and other influences beyond the interest rate. These three assumptions imply that the economy can achieve a short-run equilibrium at less than full-employment production.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius hoping to buy either a cross-cut paper shredder or a birthday greeting card for your father. Be on the lookout for rusty deck screws.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
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LRMC
Long Run Marginal Cost
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