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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.
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COEFFICIENT OF ELASTICITY A numerical measure of the relative response of one variable to changes in another variable. The coefficient of elasticity is used to quantify the concept of elasticity, including price elasticity of demand, price elasticity of supply, income elasticity of demand, and cross elasticity of demand. The coefficient can be calculated using the simple endpoint or midpoint formulas or with more sophisticated calculus and logarithmic techniques.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a battery-powered, rechargeable vacuum cleaner or a remote controlled World War I bi-plane. Be on the lookout for the happiest person in the room.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
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"Do not go where the path may lead, go instead where there is no path and leave a trail." -- Ralph Waldo Emerson
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AEA
American Economic Association
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