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LAFFER CURVE: The graphical inverted-U relation between tax rates and total tax collections by government. Developed by economist Arthur Laffer, the Laffer curve formed a key theoretical foundation for supply-side economics of President Reagan during the 1980s. It is based on the notion that government collects zero revenue if the tax rate is 0% and if the tax rate is 100%. At a 100% tax rate no one has the incentive to work, produce, and earn income, so there is no income to tax. As such, the optimum tax rate, in which government revenue is maximized, lies somewhere between 0% and 100%. This generates a curve shaped like and inverted U, rising from zero to a peak, then falling back to zero. If the economy is operating to the right of the peak, then government revenue can be increased by decreasing the tax rate. This was used to justify supply-side economic policies during the Reagan Administration, especially the Economic Recovery Tax Act of 1981 (Kemp-Roth Act).

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AUTONOMOUS CONSUMPTION

Household consumption expenditures that do not depend on income or production (especially disposable income, national income, or even gross domestic product). That is, changes in income do not generate changes in consumption. Autonomous consumption is best thought of as a baseline or minimum level of consumption that the household sector undertakes in the unlikely event that income falls to zero. It is measured by the intercept term of the consumption function or the consumption line. The alternative to autonomous consumption is induced consumption, which does depend on income.

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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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