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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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CAUSE AND EFFECT

The notion that every event in the universe is the direct result of a preceding event, that one event A causes another event B. The purpose of the scientific method is to identify these cause-and-effect relations. This pursuit is based on a simple point of view: everything happens for a reason. For every action there is a consequence. And for every consequence there is a cause.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store seeking to buy either a coffee table shaped like the state of Florida or storage boxes for your summer clothes. Be on the lookout for jovial bank tellers.
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The first paper notes printed in the United States were in denominations of 1 cent, 5 cents, 25 cents, and 50 cents.
"The less secure a man is, the more likely he is to have extreme prejudices. "

-- Clint Eastwood, actor, director

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