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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.
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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
[What's This?]
Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius seeking to buy either a how-to book on fixing your computer, with illustrations or several magazines on computer software. Be on the lookout for slow moving vehicles with darkened windows.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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"Opportunities are usually disguised as hard work, so most people don't recognize them." -- Ann Landers, columnist
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WLLN
Weak Law of Large Numbers
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