Muqaddimah empires to collapse, with the result that lower revenue was collected from high rates." He wrote: Ibn Khaldun introduced the concept now popularly known as the Laffer curve, that increases in tax rates initially increase tax revenues, but eventually the increases in tax rates cause a decrease in tax revenues. This occurs as too high a tax rate discourages producers in the economy. Ibn Khaldun used a dialectic approach to describe the sociological implications of tax choice (which now forms a part of economics theory): This analysis is very similar to the modern economic concept known as the Laffer curve.
Notional Keeneland three weeks before the running of the Kentucky Derby. He will undergo surgery for the injury which is not life-threatening, but there is question about whether he will be able to return to racing. He did not run in any of the Triple Crown races. Having an uneventful four-year-old season, Notional returned to form winning the July 5th, 2008 running of the Salvator Mile Handicap under Joe Bravo. Notional Notional (born February 1, 2004 in California) is an American Thoroughbred racehorse. He was sired by In Excess and out of the mare Truly Blessed. His damsire, French Deputy, is