Why Do Republicans Think They Can Deliver Economic Growth?

According to press reports, the Trump administration is basing its budget projections on the assumption that the U.S. economy will grow very rapidly over the next decade — in fact, almost twice as fast as independent institutions like the Congressional Budget Office and the Federal Reserve expect. There is, as far as we can tell, no serious analysis behind this optimism; instead, the number was plugged in to make the fiscal outlook appear better.