Paul Krugman, Larry Summers, and the Fed's Unused Ammunition

Paul Krugman and Larry Summers both have very good columns this morning noting the economy's continuing weakness and warning against excessive rate hikes by the Fed. While I fully agree with their assessment of the state of the economy and the dangers of Fed rate hikes, I think they are overly pessimistic about the Fed's scope for action if the economy weakens.

While the Fed did adopt unorthodox monetary policy in this recession in the form of quantitative easing, the buying of long-term debt...