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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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AUTONOMOUS INVESTMENT

Business investment expenditures that do not depend on income or production (especially national income or even gross domestic product). That is, changes in income do not generate changes in investment. Autonomous investment is best thought of as investment that the business sector undertakes regardless of the state of the economy. It is measured by the intercept term of the investment line. The alternative to autonomous investment is induced investment, which does depend on income.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store looking to buy either a how-to book on home repairs or a large, stuffed kitty cat. Be on the lookout for gnomes hiding in cypress trees.
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In the early 1900s around 300 automobile companies operated in the United States.
"I do the best I know how, the very best I can, and I mean to keep doing so until the end. "

-- Abraham Lincoln, 16th US president

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