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OLIGOPOLY AND MONOPOLY: Oligopoly and monopoly have some similarities, both tend to be relatively large and possess significant market control, but also have a few important differences, oligopoly market has more than one firm. The dividing line between oligopoly and monopoly, however, can be blurred due to the closeness of substitutes and the inclination of oligopoly firms to collude.

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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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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway seeking to buy either income tax software or a how-to book on the art of negotiation. Be on the lookout for letters from the Internal Revenue Service.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"Life is no brief candle to me. It is a sort of splendid torch which I have got a hold of for the moment, and I want to make it burn as brightly as possible before handing it on to future generations."

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Marginal Rate of Substitution
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