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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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FALLACY OF COMPOSITION

The logical fallacy of arguing that what is true for the parts is also true for the whole. In the study of economics, this takes the form of assuming that what works for parts of the economy, such as households or businesses, also works for the aggregate, or macroeconomy. The contrasting fallacy is the fallacy of division.

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Today, you are likely to spend a great deal of time flipping through the yellow pages wanting to buy either a how-to book on wine tasting or a bookshelf that will fit in your closet. Be on the lookout for fairy dust that tastes like salt.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."

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