Reaganomics the tax rate cuts would more than cover any increases in federal debt, was influenced by a theoretical taxation model based on the elasticity of tax rates, known as the Laffer curve. Arthur Laffer's model predicts that excessive tax rates actually reduce potential tax revenues, by lowering the incentive to produce; the model also predicts that insufficient tax rates (rates below the optimum level for a given economy) lead directly to a reduction in tax revenues. Reagan lifted remaining domestic petroleum price and allocation controls on January 28, 1981, and lowered the oil windfall profits tax in August 1981. He
Ibn Khaldun scholars is increasingly common. Influential British historian and international affairs specialist Arnold J. Toynbee has called Ibn Khaldun's Muqaddimah "the greatest work of its kind." Ernest Gellner, once a professor of philosophy and logic at the London School of Economics, considered Khaldun's definition of government the best in the history of political theory. More moderate views on the scope of Ibn Khaldun's contributions have emerged. Arthur Laffer, for whom the Laffer curve is named, acknowledged that Ibn Khaldun's ideas, as well as others, precede his own work on that curve. A focus on understanding the nuances of Ibn Khaldun's contributions