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ELASTIC: In general, if changes in variable A cause changes in variable B, then the relative change in B is greater than the relative change in A. In other words, small changes in variable A cause relatively larger changes in variable B. An elastic relationship between two variables is a very responsive, or stretchable, relationship. You should compare elastic with inelastic.

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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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Today, you are likely to spend a great deal of time lost in your local discount super center trying to buy either a really, really exciting, action-filled video game or a coffee cup commemorating the moon landing. Be on the lookout for crowded shopping malls.
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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.
"Confidence . . . thrives on honesty, on honor, on the sacredness of obligations, on faithful protection and on unselfish performance. Without them it cannot live."

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