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ANNUAL: A standard 12-month period, or one year, used for reporting economic and financial data. Gross Domestic Product and related measures are noted economic data released annually. Many businesses also provide annual financial reports. Another standard reporting period is the quarter.

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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 driving to a factory outlet seeking to buy either one of those "hang in there" kitty cat posters or a velvet painting of Elvis Presley. Be on the lookout for high interest rates.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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MC
Marginal Cost
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