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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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THEORY

An empirically verified, interrelated body of general principles, axioms, and assumptions that is used to explain and understand real world phenomena. Theories are the cornerstone of the scientific method. They generate the hypotheses that are verified against real world data. The construction and refinement of theories, accomplished through the hypothesis verification process, is the primary goal of doing science.

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Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either a birthday gift for your mother or a weathervane with a horse on top. Be on the lookout for high interest rates.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
"Chance favors only the prepared mind."

-- Louis Pasteur, biologist

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International Monetary Found
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