We've all heard the so-called "trickle-down" dimunition of capitalism trotted out by liberal-statists.  Here is a superb refutation of it by Steven Horwitz, which follows Thomas Sowell's excellent "'Trickle Down' Theory and 'Tax Cuts for the Rich'," which can be found here:  http://www.tsowell.com/images/Hoover%20Proof.pdf.