Harvard professors Carmen Reinhart and Kenneth Rogoff  are accusing Paul Krugman of “spectacularly uncivil” behaviour.n normal times, an arithmetic mistake in an economics paper would be a complete nonevent as far as the wider world was concerned. But in April 2013, the discovery of such a mistake—actually, a coding error in a spreadsheet, coupled with several other flaws in the analysis—not only became the talk of the economics profession, but made headlines. Looking back, we might even conclude that it changed the course of policy.Why? Because the paper in question, “Growth in a Time of Debt,” by the Harvard economists Carmen Reinhart and Kenneth Rogoff, had acquired touchstone status in the debate over economic policy. Ever since the paper was first circulated, austerians—advocates of fiscal austerity, of immediate sharp cuts in government spending—had cited its alleged findings to defend their position and attack their critics. We were met with declarations that Reinhart and Rogoff had shown that waiting would be disastrous, that economies fall off a cliff once government debt exceeds 90 percent of GDP.“You have attacked us in very personal terms, virtually non-stop, in your New York Times column and blog posts,” the pair continued. “… Your characterization of our work and of our policy impact is selective and shallow. It is deeply misleading about where we stand on the issues. And we would respectfully submit, your logic and evidence on the policy substance is not nearly as compelling as you imply.”Reinhart and Rogoff