Lawrence Summers is a New Keynesian economist. That means something. While there are nuances that exist between members of that school of thought, mostly to do with policy sensitivities and speeds of adjustment, the New Keynesian paradigm has demonstrated clearly that it is incapable of capturing the macroeconomic dynamics in any consistent manner, despite it being the dominant approach in the profession. So, it is no wonder when Summers provides opinions the underlying logic he demonstrates is similarly flawed. Unfortunately, he keeps getting important platforms to express these opinions, which continues to blight the public policy debate. He was at it again when he started lecturing the US Federal Reserve Bank on the conduct of its asset-purchasing program.