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GOOD: When used without an adjective modifier (like "final" good or "intermediate" good), this generically means a physical, tangible product used to satisfy people's wants and needs . This term good should be contrasted with the term service, which captures the intangible satisfaction of wants and needs. As such, you will frequently see the plural combination of these two phrases together "goods and services" to indicate the wide assortment of economic goods produced using the economy's scarce resources. As you might imagine this general notion of wants and needs satisfying goods and services pops up throughout the study of economics.

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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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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors hoping to buy either several magazines on computer software or a T-shirt commemorating the second moon landing. Be on the lookout for poorly written technical manuals.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"We succeed in enterprises (that) demand the positive qualities we possess, but we excel in those (that) can also make use of our defects."

-- Alexis de Tocqueville, Statesman

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