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TAX MULTIPLIER: The ratio of the change in aggregate output (or gross domestic product) to an autonomous change in a taxes. The tax multiplier is equal to the expenditure multiplier times the marginal propensity to consume. This is based on the only a fraction of the change in disposable income resulting from the change in taxes will result in a change in consumption expenditures. The tax multiplier can be used to indicate the change in fiscal policy induced government taxes are needed to achieve a given level of aggregate output (presumably full-employment output).

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HERFINDAHL INDEX

A measure of concentration of the production in an industry calculated as the sum of the squares of market shares for each firm. This is one method of summarizing the degree to which an industry is oligopolistic and the concentration of market control held by the largest firms in the industry. Two other measures of industry concentration are the four-firm concentration ratio and the eight-firm concentration ratio.

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Today, you are likely to spend a great deal of time at a crowded estate auction wanting to buy either a large red and white striped beach towel or a bottle of blackcherry flavored spring water. Be on the lookout for telephone calls from former employers.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
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