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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.
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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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PINK FADFLY
[What's This?]
Today, you are likely to spend a great deal of time watching infomercials hoping to buy either a package of blank rewritable CDs or yellow cotton balls. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Lombard Street is London's equivalent of New York's Wall Street.
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"Whenever you see a successful business, someone once made a courageous decision." -- Peter F. Drucker, business strategist
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SEC
Securities and Exchange Commision
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