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AGGREGATION: The process of adding up, summing, or otherwise identifying the total value of a variable or measure, especially when used in the study of macroeconomics. Common items that are aggregated are demand, supply, and expenditures on gross domestic product, which result in aggregate demand, aggregate supply, and aggregate expenditures.

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MIDPOINT ELASTICITY FORMULA

A simple technique for calculating the coefficient of elasticity by estimating the average elasticity for discrete changes in two variables. The distinguishing characteristic of this formula is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than initial values. An alternative technique is the endpoint elasticity formula.

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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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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"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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