Some doctrinaire Keynesian economists would say any stimulus over the next few years won’t affect our ability to deal with deficits in the long run. This is wrong as a simple matter of arithmetic. The fiscal gap is the government’s credit-card bill and each year’s 14 percent of GDP is the interest on that bill. If it doesn’t pay this year’s interest, it will be added to the balance. Demand-siders say forgoing this year’s 14 percent fiscal tightening, and spending even more, will pay for itself, in present value, by expanding the economy and tax revenue. My reaction? Get real, or go hang out with equally deluded supply-siders. Our country is broke and can no longer afford no- pain, all-gain “solutions.”