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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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EXPENDITURES MULTIPLIER

A measure of the change in aggregate production caused by changes in an autonomous expenditure. The expenditures multiplier is the inverse of one minus the slope of the aggregate expenditures line. The simple expenditures multiplier includes ONLY induced consumption. More complex expenditures multipliers include other induced components. Two related multipliers are the tax multiplier, which measures the change in aggregate production caused by changes in taxes, and the balanced-budget multiplier which measures the change in aggregate production from equal changes in both taxes and government purchases.

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Today, you are likely to spend a great deal of time watching the shopping channel trying to buy either storage boxes for your computer software CDs or a set of tires. Be on the lookout for small children selling products door-to-door.
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It's estimated that the U.S. economy has about $20 million of counterfeit currency in circulation, less than 0.001 perecent of the total legal currency.
"I shall do less whenever I shall believe what I am doing hurts the cause and I shall do more whenever I shall believe doing more will help the cause. I shall try to correct errors when shown to be errors and I shall adopt new views so fast as they shall appear to be true views. "

-- Abraham Lincoln, 16th US president

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