Last month in this space I argued that we may be in a period of secular stagnation in which sluggish growth, output and employment at levels well below potential, and problematically low real interest rates might coincide for quite some time to come. Since the beginning of this century U.S. GDP growth has averaged less than 1.8 percent per year. Right now the economy is operating at nearly 10 percent — or more than $1.6 trillion — below what was judged to be its potential path as recently as 2007. And all this is in the face of negative real interest rates out for more than 5 years and extraordinarily easy monetary policies.