Paul Krugman is attending the annual IMF research conference and reports that the presentations have covered a wide range of topics:

It’s pretty clear, however, that the blockbuster paper of the conference will be one that focuses on the truly ugly: the evidence that by tolerating high unemployment we have inflicted huge damage on our long-run prospects.

How so? According to the paper (with the unassuming title “Aggregate Supply in the United States: Recent Developments and Implications for the Conduct of Monetary Policy”), our seemingly endless slump has done long-term damage through multiple channels. The long-term unemployed eventually come to be seen as unemployable; business investment lags thanks to weak sales; new businesses don’t get started; and existing businesses skimp on research and development.

….The evidence is overwhelming that by failing to respond effectively to mass unemployment — by not even making unemployment a major policy priority — we’ve done ourselves immense long-term damage. And it is, as I said, a bitter irony, because one main reason we’ve done so little about unemployment is the preaching of deficit scolds, who have wrapped themselves in the mantle of long-run responsibility — which they have managed to get identified in the public mind almost entirely with holding down government debt.