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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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AVERAGE REVENUE PRODUCT AND MARGINAL REVENUE PRODUCT

A mathematical connection between average revenue product and marginal revenue product stating that the change in the average revenue product depends on a comparison between the average revenue product and marginal revenue product. If marginal revenue product is less than average revenue product, then average revenue product declines. If marginal revenue product is greater than average revenue product, then average revenue product rises. If marginal revenue product is equal to average revenue product, then average revenue product does not change.

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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for telephone calls from long-lost relatives.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"He, who every morning plans the transactions of the day, and follows that plan, carries a thread that will guide him through a labyrinth of the most busy life."

-- Victor Hugo, Writer

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