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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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PERFECT COMPETITION, TOTAL ANALYSIS

A perfectly competitive firm produces the profit-maximizing quantity of output that generates the greatest difference between total revenue and total cost. This total approach is one of three methods that used to determine the profit-maximizing quantity of output. The other two methods involve the direct analysis of economic profit or a comparison of marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time searching the newspaper want ads looking to buy either a birthday gift for your father that doesn't look like every other birthday gift for your father or a green fountain pen. Be on the lookout for high interest rates.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
"Good plans shape good decisions. That's why good planning helps to make elusive dreams come true."

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