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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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TAX MULTIPLIER

A measure of the change in aggregate production caused by changes in government taxes. The tax multiplier is the negative marginal propensity to consume times one minus the slope of the aggregate expenditures line. The simple tax multiplier includes ONLY induced consumption. More complex tax multipliers include other induced components. Two related multipliers are the expenditures multiplier, which measures the change in aggregate production caused by changes in an autonomous aggregate expenditure, 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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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time searching the newspaper want ads looking to buy either an AC adapter that won't fry your computer or a case for your designer sunglasses. Be on the lookout for jovial bank tellers.
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John Maynard Keynes was born the same year Karl Marx died.
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-- Benjamin Franklin, statesman, inventor

PDI
Personal Disposable Income
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