Latest shots in the austerity debate: Krugman vs. Reinhart and Rogoff

That The Colbert Report spent more than seven minutes talking about a spreadsheet error in a seminal economics paper is a sign that the austerity debate has reached a whole new level. (Watch the video below.)

The error was in a study by Carmen Reinhart and Kenneth Rogoff that famously asserted that economic growth slowed after a country's public debt equaled 90 percent of its GDP — a so-called tipping point that conservative lawmakers around the world have used to justify austerity policies.

But three economists from the University of Massachusetts, Amherst, claimed that when the spreadsheet error was corrected, the study showed that countries that hit the 90 percent threshold saw economic growth of 2.2 percent — not a contraction of 0.1 percent, as Reinhart and Rogoff had initially stated.

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In an op-ed in The New York Times, Reinhart and Rogoff admitted that the Amherst researchers had "correctly identified a spreadsheet coding error that led us to miscalculate the growth rates of highly indebted countries since World War II."

They argued, however, that the fundamental conclusion of their report remains true, namely "that episodes of high debt (90 percent or more) were rare, long, and costly."

After reviewing their own work, they now say that countries that pass the 90 percent mark see 2.3 percent growth, down from 3.5 percent if they stay under that threshold. In other words, not negative growth, but still a significant drop. That's reason enough to consider austerity measures, albeit carefully considered ones, say Reinhart and Rogoff:

Their op-ed also focuses on the political attacks they have received, which, in their view, are "a sad commentary on the politicization of social science research." They also balk at the suggestion that they ever posited that "90 percent was a magic threshold that transforms outcomes, as conservative politicians have suggested."

Paul Krugman, publishing an op-ed in the Times on the same day, doesn't buy Reinhart and Rogoff's latest conclusions. In fact, he claims he didn't believe them in the first place, arguing that "many economists raised fundamental questions about Reinhart-Rogoff long before we knew about the famous Excel error."

In Krugman's view, flawed research is dangerous because the wealthiest and most powerful Americans are so eager to embrace it:

Matthew Yglesias, weighing in at Slate, argues that Rogoff isn't an apolitical observer, but someone who has written op-eds and delivered testimony to Congress based on policy conclusions drawn from his own paper.

Whether you believe Reinhart and Rogoff or not, this whole brouhaha is a reminder that politics and economics are often inextricable, no matter how cold and impartial the numbers look.