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INDUSTRY: A group of firms producing goods or services that are close substitutes-in-consumption. The similarity of the products makes it possible to analyze the production in a market framework. An industry can be broadly defined, such as the manufacturing industry, or narrowly specified, such as the root beer industry. For most economic analysis the term industry is used interchangeably with the term market.

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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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YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either a birthday greeting card for your father or a T-shirt commemorating the first day of spring. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Two and a half gallons of oil are needed to produce one automobile tire.
"What gets measured gets done."

-- Peter Drucker, educator

GARCH
Generalized Autoregressive Conditional Heteroskedasticity
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