Paul Krugman and the 90 Percent Zombie

Paul Krugman is engaged in battle with the 90 percent zombie: the claim that economies go to hell when their ratio of debt to GDP exceeds 90 percent. He makes the obvious point that it is really impossible to untangle cause and effect with such a small sample. The countries that had debt to GDP ratios above 90 percent all had other major problems that likely would have impeded growth even if they had no debt.

I have written numerous times as to why this claim is beyond silly. Among other thin...