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ENDPOINT FORMULA: A simple technique for calculating the coefficient of elasticity that estimates the elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of this formula is that percentage changes are calculated based on the initial values of each variable. This is much simpler than the midpoint formula, which is based on the percentage change from an average of the initial and ending values. The primary problem with the endpoint formula is that different elasticity values are obtained for price increases than for price decreases of the same segment of the demand curve.

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PERFECT COMPETITION, REALISM

Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to one or two of the four key characteristics of perfect competition, none matches all four sufficiently that they can be declared PERFECTLY competitively. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers looking to buy either a weathervane with a cow on top or a box of multi-colored, plastic paper clips. Be on the lookout for celebrities who speak directly to you through your television.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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