By Ezra KleinSeptember 19, 2012 at 1:49 p.m. UTCYou've probably heard of "the Laffer curve," the tax chart that Arthur Laffer sketched on the back of a napkin for Ronald Reagan, and that supposedly heavily influenced Reagan's thinking on tax cuts. Well, here's the Tabarrok curve:Support our journalism. Subscribe today.arrow-rightI agree with Alex Tabarrok's napkin curve, by the way. So who will be the first president to take it up as a cause?You can read much more from Tabarrok on patents here. Or you can listen to the excellent "This American Life" on the subject here.Call it the Tabarrok CurveToday's HeadlinesThe most important news stories of the day, curated by Post editors and delivered every morning.