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OLIGOPOLY, REALISM: Real world markets are heavily populated by oligopoly. About half of all output produced in the U.S. economy each year is done so by oligopoly firms. Other industrialized nations can make a similar claim. Oligopoly markets arise in a wide assortment different industries, ranging from manufacturing to retail trade to resource extraction to financial services.
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FOUR-FIRM CONCENTRATION RATIO The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either an electric coffee pot with automatic shutoff or a brown leather attache case. Be on the lookout for defective microphones.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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"One day at a time - this is enough. Do not look back and grieve over the past, for it is gone: and do not be troubled about the future, for it has not yet come. Live in the present, and make it so beautiful that it will be worth remembering." -- Ida Scott Taylor, Author
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BLS
Bureau of Labor Statistics
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