Wingnut “proofs” that government spending doesn’t actually stimulate the economy have something in common with the aerodynamic analysis that shows a bumblebee can’t fly: when the facts conflict with your theory, it’s the theory that’s supposed to yield. But Robert Frank points out the obvious fallacy in the argument that deficit spending, by raising public sector debt and thereby threatening higher tax rates in the future, will depress consumer and business spending now: getting the economy back to producing at its full potential faster increases future revenues at any given set of tax rates and thereby reduces the tax level required to support any future level of public services.