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Krugman: A Graph for Reinhart and Rogoff

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12월 28, 2013
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Econintersect:  Paul Krugman has two graphs in his IMF Conference paper (14th Jacques Polak Annual Research Conference, November 7-8, 2013) which can serve as an object lesson in anlysis for Harvard professors Carmen Reinhart and Kenneth Rogoff.  The lesson is so simple that one would think it would be too obvious to be of note.

teacher-at-board-360x240

Krugman presents a graph from a paper by David Greenlaw, James D. Hamilton, Peter Hooper and Frederic S. Mishkin (NBER Working Paper No. 19297, August 2013) who used it in support of their argument that there is a tipping point for high sovereign debt which will result in high interest rates.

debt-interest-rates-krugman-fig.1-2013-nov

Krugman says:

Japan, at the lower right, is an outlier, but otherwise the data seem to show a clear positive  relationship between debt and borrowing costs, leading – or so Greenlaw et al suggest – to a possible vicious circle of rising rates and exploding debt once debt gets beyond a critical level, probably less than  100 percent of GDP.

Krugman then presents a second graph of the same data, with the data points segregated into countries that are sovereign issuers of their own currency in one group and  countries that use a currency that is issued by someone else.

debt-interest-rates-krugman-fig.2-2013-nov

Lo and behold, Japan is no longer an anomaly!

The relationship between debt and interest rates has two clearly defined different functions depending on the control point for the issuance of currency.

All the flap over spread sheet errors in the Reinhart and Rogoff studies was a minor factor.  The real question is the effect on their analysis if the two types of currency regimes were recognized.

John Lounsbury

Sources:

  • Currency Regimes, Capital Flows, and Crises (Paul Krugman, IMF, 14th Jacques Polak Annual Research Conference, 07-08 November 2013)
  • Crunch Time: Fiscal Crises and the Role of Monetary Policy (David Greenlaw, James D. Hamilton, Peter Hooper and Frederic S. Mishkin (NBER Working Paper No. 19297, August 2013)
  • Bill Mitchell Takes Reinhart and Rogoff to Task, Again (GEI News, 27 November 2013)
  • Reinhart and Rogoff Critics Won’t Go Away (GEI News, 23 April 2013)
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