Stop the presses. The economics world is about to be rocked (or is being rocked) by another spectacular, epic fight over the fate of the world. Well, actually only over
some obscure math.
Today the Twitterverse exploded with chatter about a new research paper
claiming to find holes in a landmark academic paper that’s been cited to
justify extreme austerity measures. By mid-afternoon the
authors—Harvard economists Carmen Reinhart and Kenneth Rogoff—had
e-mailed reporters a quick reply defending their work.
...
“Growth in a Time of Debt”
(2010) by Reinhart and Rogoff argues that countries’ economic growth
slows when government debt levels rise, with a noticeable breaking point
at debt equal to or exceeding 90 percent of gross domestic product.
So economics journalists went bonkers after Mike Konczal of the Roosevelt Institute in New York reported on a new critique (PDF)
by three economists from the University of Massachusetts at
Amherst—Thomas Herndon, Michael Ash, and Robert Pollin. What makes the
UMass study credible is that Reinhart and Rogoff gave the authors the
original data, allowing them to try to replicate the results. Herndon, Ash, and Pollin said they found three important errors in what they described as a working paper.
The Rogoff/Reinhart thesis has been dynamite in the economics world (inexplicably of course; how the notion that excessive debt leads to ruin can be groundbreaking is beyond us mere layfolk), and to be challenged not as a matter of theory, but of computation, is dynamite as well. Well, maybe not. Larry Summers wrote an influential paper that was found to be garbage when the conclusions fell apart by removing data from one country, (economic power house Botswana), and he did OK for himself.
DeLong and Lawrence Summers co-authored
"Equipment Spending and Economic Growth" in the Quarterly Journal of
Economics in 1991, and "Equipment Spending and Economic Growth: How
Strong is the Nexus?" in the Brookings Papers on Economic Activity
in 1992. The papers were presentations of an empirical study showing higher
social returns to capital equipment investment than would be predicted by the
classic Solow growth model. But only a year later, "Reassessing the
Social Returns to Equipment Investment," an NBER Working Paper by
Hassett, Alan J. Auerbach and Stephen D. Oliner, revealed that
DeLong and Summers were just flat-out wrong, and for the most embarrassing of
reasons: their results fell apart with the removal of Botswana from their data
set:
"DeLong and Summers' own data fail to reject the Solow model for the OECD
countries. The same is true even for their full sample of quite heterogeneous
nations if we exclude just one country (Botswana). These results clearly
refute DeLong and Summers' claim to have uncovered robust evidence of
uniformly high social returns to equipment investment."
Hassett's paper was published in 1994 in the Quarterly Journal of Economics -- the same Harvard-sponsored
journal that had published the original erroneous DeLong/Summers work.
After this embarrassing debacle, Teflon-coated Summers managed to go on
with his career, eventually becoming Treasury secretary under Bill Clinton,
and then president of Harvard.
Even if the critique turns out to be valid and Rogoff and Reinhart's
paper does not hold up, do not weep for them. Their careers and stature
will be intact. That said, it will be embarrassing for the rarefied air of the Harvard economics department to have been sullied with the notion of professional accountability at the hands of ...BLEH...UMASS.
Of course, the media is quick to turn to the political implications because this relatively meaningless fight over math is an opening by which they can trash the right.
It’s been cited repeatedly in the U.S. and elsewhere to justify budget
cuts by policymakers and legislators, House Budget Committee Chairman
Paul Ryan among them.
Putting aside the fact that what is being called "austerity" is
complete bullshit, the notion that if R-R's calculation are incorrect then massive, debt-fueled government spending is somehow not dangerous, is preposterous. But then again we are talking about
academic economics here. So, forget Greece, forget the slow-rolling collapse of massively indebted European PIIGs, forget toilet-swirling Argentina...Paul Ryan is a dastardly evil heartless shit because...R-R's spreadsheets!
Regardless of the way this spat turns out, the truth remains, countries DO go bust (with the attendant economic collapse) and they go bust by accumulating too much DEBT. You don't need a spreadsheet to know that much.