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GROWTH RATE: The percentage change in a variable from one year to the next. The growth rate, in effect, measures how much the variable is growing over time. In that economists (as well as regular human people) are quite interested in economic growth, progress, and a lessening of the scarcity problem, growth rates for different economic variables are closely scrutinized. Among the most important are: real gross domestic product, population, and per capita income. Growth rates are important not only for the analysis of long-run progress (economic growth, economic development), but also short-run instability (business cycles)
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KINKED-DEMAND CURVE ANALYSIS An analysis using the kinked-demand curve to explain rigid prices often found with oligopoly. The kinked-demand curve contains two distinct segments--one for higher prices that is more elastic and one for lower prices that is less elastic. Key to this analysis is that the corresponding marginal revenue curve contains three segments--one associated with the more elastic segment, one associated with the less elastic segment, and one associated with the kink. A profit-maximizing firm can then equate marginal cost to a wide range of marginal revenue values along the vertical segment of the marginal revenue curve. This suggests that marginal cost must change significantly before an oligopolistic firm is inclined to change price.
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During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
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"If anything terrifies me, I must try to conquer it. " -- Francis Charles Chichester, yachtsman, aviator
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MRS
Marginal Rate of Substitution
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