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POINT ELASTICITY: The relatively responsiveness of a change in one variable (call it B) to an infinitesimally small change in another variable (call it A). The notion of point elasticity typically comes into play when discussing the elasticity at a specific point on a curve.< P>Point elasticity can be calculated in a number of different ways. Sophisticated economists, using sophisticated mathematical techniques (better known as calculus) can calculate point elasticity by taking derivatives of equations. Derivatives is fancy calculus talk for infinitesimally small changes.

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DEMAND

The willingness and ability to buy a range of quantities of a good at a range of prices, during a given time period. Demand is an inverse relation between price (demand price) and quantity (quantity demanded). Demand is one half of the market exchange process--the other is supply. This demand side of the market draws inspiration from the unlimited wants and needs dimension of the scarcity problem.

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Today, you are likely to spend a great deal of time at a dollar discount store hoping to buy either a pair of gray heavy duty boot socks or a 50-foot blue garden hose. Be on the lookout for crowded shopping malls.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"Divide each difficulty into as many parts as is feasible and necessary to resolve it."

-- Rene Descartes

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