Krugman and DeLong on Avoiding Secular Stagnation

Brad DeLong and Paul Krugman are having some back and forth on the problem of secular stagnation and what it would have taken to avoid a prolonged period of high unemployment. I thought I would weigh in quickly since I have a better track record on this stuff than either of them. 

The basic story going into the crash was that we had an economy that was being driven by the housing bubble. This was both directly through residential construction and indirectly through the consumption that f...