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ELASTICITY: The relative response of one variable to changes in another variable. The phrase "relative response" is best interpreted as the percentage change. For example, the price elasticity of demand, one of the more important applications of this concept in economics, is the percentage change in quantity demanded measured against the percentage change in price. Other notable economic elasticities are the price elasticity of supply, income elasticity of demand, and cross elasticity of demand.

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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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RED AGGRESSERINE
[What's This?]

Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either a Boston Red Sox baseball cap or a square lamp shade with frills along the bottom. Be on the lookout for high interest rates.
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This isn't me! What am I?

A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"You can't use up creativity. The more you use, the more you have. "

-- Maya Angelou, poet

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