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INDIRECT: The mathematical notion that two variables change in the opposite directions, that is, an increase in X goes with a decrease in Y, or a decrease in X goes with an increase in Y. The alternative to an indirect relation is a direct relation, in which an increase in one variable goes with an increase in the other. Indirect relations are graphically illustrated by negatively-sloped curves, a common example being the demand curve.
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ASSUMPTIONS, CLASSICAL ECONOMICS Classical economics, especially as directed toward macroeconomics, relies on three key assumptions--flexible prices, Say's law, and saving-investment equality. Flexible prices ensure that markets adjust to equilibrium and eliminate shortages and surpluses. Say's law states that supply creates its own demand and means that enough income is generated by production to purchase the resulting production. The saving-investment equality ensures that any income leaked from consumption into saving is replaced by an equal amount of investment. Although of questionable realism, these three assumptions imply that the economy would operate at full employment.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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"Whatever course you decide upon, there is always someone to tell you that you are wrong. There are always difficulties arising which tempt you to believe that your critics are right. To map out a course of action and follow it to an end requires...courage." -- Ralph Waldo Emerson
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ARIMA
Autoregressive Integrated Moving Average
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