Some time ago speaking at the IMF, I joined others who have invoked the old idea of secular stagnation and raised the possibility that the American and global economies could not rely on normal market mechanisms to assure full employment and strong growth without sustained unconventional policy support. My concern rested on a number of considerations. First, even though financial repair had largely taken place four years ago, recovery since that time has only kept up with population growth and normal productivity growth in the United States, and has been worse elsewhere in the industrial world. Second, manifestly unsustainable bubbles and loosening of credit standards during the middle of the last decade, along with very easy money, were sufficient to drive only moderate economic growth. Third, short-term interest rates are severely constrained by zero lower bound and there is very little scope for further reductions in either term premia or credit spreads, and so real interest rates may not be able to fall far enough to spur enough investment to lead to full employment. Fourth, in such a situation falling wages and prices or inflation at slower-than-expected rates is likely to worsen economic performance by encouraging consumers and investors to delay spending, and to redistribute income and wealth from higher spending debtors to lower spending creditors.