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HERFINDAHL 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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INCOME EFFECT

The change in quantity demanded that results because a change in the demand price of a good affects real income (that is, the purchasing power of income) even though nominal income remains the same. This is one of two reasons, or effects, underlying the law of demand and the negative slope of the market demand curve. The other is the substitution effect.

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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites looking to buy either a three-hole paper punch or decorative picture frames. Be on the lookout for infected paper cuts.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"There comes a time when the mind takes a higher plane of knowledge but can never prove how it got there. "

-- Albert Einstein, physicist

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