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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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FALLACIES

Logical errors in an argument or evaluation of a policy. The six common fallacies that surface in economic analysis are: false cause, personal attack, division, composition, false authority, and mass appeal. These fallacies are most troublesome because, although false, they seem correct, especially when used by slick-talking, charismatic people (politicians) or when the fallacies support preconceived notions or fundamental beliefs.

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Today, you are likely to spend a great deal of time searching the newspaper want ads wanting to buy either several magazines on time travel or 500 feet of telephone cable. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
"In every man's life there lies latent energy. There is, however, a spark that, if kindled, will set the whole being afire, and he will become a human dynamo, capable of accomplishing almost anything to which he aspires. "

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