If you want a real life example of how tax cuts boost the economy, take a look at the Homeland Investment Act of 2004. This law allowed U.S. corporations to repatriate earnings from foreign operations back to these shores for one year at a reduced tax rate of 5.25%. Supporters argued that this tax cut would lead to an "in-sourcing" of jobs by luring corporate income parked in foreign vaults back to America. Those repatriated dollars could then be put to work for R&D spending, plant expansions, capital and technology purchases, or merely to improve balance sheets to the benefit...