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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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PERFECT COMPETITION, DEMAND The demand curve for the output produced by a perfectly competitive firm is perfectly elastic at the going market price. The firm can sell all of the output that it wants at this price because it is a relatively small part of the market. As a price taker, the firm has no ability to charge a higher price and no reason to charge a lower one. The market price facing a perfectly competitive firm is also average revenue and, most important, marginal revenue.
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Today, you are likely to spend a great deal of time driving to a factory outlet looking to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for high interest rates.
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The first paper notes printed in the United States were in denominations of 1 cent, 5 cents, 25 cents, and 50 cents.
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"Believe and act as if it were impossible to fail." -- Charles F. Kettering
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