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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.
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COMMODITY MONEY A medium of exchange (money) that has both value in use and value in exchange. Commodity money is first and foremost a commodity that provides users with satisfaction of their wants and needs. However, it also has the secondary function of acting as a medium of exchange for the economy. In the march toward economic complexity, commodity money emerged from barter exchanges, but then ultimately gave way to modern fiat money.
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GREEN LOGIGUIN
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Today, you are likely to spend a great deal of time searching for a specialty store seeking to buy either a wall poster commemorating last Friday (you know why) or a country wreathe. Be on the lookout for malfunctioning pocket calculators.
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This isn't me! What am I?
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Two and a half gallons of oil are needed to produce one automobile tire.
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"The greatest barrier to success is the fear of failure." -- Sven Goran Eriksson, writer
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APP
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