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The commodity currency puzzle

This paper addresses the purchasing power parity (PPP) puzzle for commodity currencies. A substantial part of the literature on commodity currencies has found that, despite controlling for the effect of commodity prices, PPP does not hold in the long run. We show that once we also control for the effect of the interest rate differential in the real exchange rate relationship, the discrepancies from PPP are fully accounted for. The analysis is applied to the real exchange rate behaviour in Norway, which has a primary commodity (oil) that constitutes the majority of its exports. We show that with the interest rate differential included in the long run real exchange rate relationship, the real oil price plays a minor role. Adjustment to equilibrium (half-lives) is also substantially reduced, taking no more than one year on average. Hence, contrary to earlier findings on commodity currencies, we have effectively removed the PPP puzzle.

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Paper provided by Statistics Norway, Research Department in its series Discussion Papers with number 423.

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Date of creation: May 2005
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Handle: RePEc:ssb:dispap:423
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  1. Engel, Charles, 1996. "The forward discount anomaly and the risk premium: A survey of recent evidence," Journal of Empirical Finance, Elsevier, vol. 3(2), pages 123-192, June.
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  4. Bjørnland, Hilde C. & Hungnes, Håvard, 2003. "Fundamental determinants of the long run real exchange rate: The case of Norway," Memorandum 23/2002, Oslo University, Department of Economics.
  5. Hamilton, James D., 1996. "This is what happened to the oil price-macroeconomy relationship," Journal of Monetary Economics, Elsevier, vol. 38(2), pages 215-220, October.
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  9. Knut Anton Mork & Oystein Olsen & Hans Terje Mysen, 1994. "Macroeconomic Responses to Oil Price Increases and Decreases in Seven OECD Countries," The Energy Journal, International Association for Energy Economics, vol. 0(Number 4), pages 19-36.
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  11. Johansen, Søren & Juselius, Katarina, 1992. "Testing structural hypotheses in a multivariate cointegration analysis of the PPP and the UIP for UK," Journal of Econometrics, Elsevier, vol. 53(1-3), pages 211-244.
  12. Murray, Christian J. & Papell, David H., 2002. "The purchasing power parity persistence paradigm," Journal of International Economics, Elsevier, vol. 56(1), pages 1-19, January.
  13. Chen, Yu-chin & Rogoff, Kenneth, 2003. "Commodity currencies," Journal of International Economics, Elsevier, vol. 60(1), pages 133-160, May.
  14. Kenneth Rogoff, 1996. "The Purchasing Power Parity Puzzle," Journal of Economic Literature, American Economic Association, vol. 34(2), pages 647-668, June.
  15. Papell, David H., 1997. "Searching for stationarity: Purchasing power parity under the current float," Journal of International Economics, Elsevier, vol. 43(3-4), pages 313-332, November.
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  17. Bennett T. McCallum, 1992. "A Reconsideration of the Uncovered Interest Parity Relationship," NBER Working Papers 4113, National Bureau of Economic Research, Inc.
  18. O'Connell, Paul G. J., 1998. "The overvaluation of purchasing power parity," Journal of International Economics, Elsevier, vol. 44(1), pages 1-19, February.
  19. Q. Farooq Akram, 2004. "Oil prices and exchange rates: Norwegian evidence," Econometrics Journal, Royal Economic Society, vol. 7(2), pages 476-504, December.
  20. Meese, Richard A. & Rogoff, Kenneth, 1983. "Empirical exchange rate models of the seventies : Do they fit out of sample?," Journal of International Economics, Elsevier, vol. 14(1-2), pages 3-24, February.
  21. Kremers, Jeroen J M & Ericsson, Neil R & Dolado, Juan J, 1992. "The Power of Cointegration Tests," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 54(3), pages 325-48, August.
  22. Charles Engel, 1998. "Long-Run PPP May Not Hold After All," Discussion Papers in Economics at the University of Washington 0050, Department of Economics at the University of Washington.
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  24. Akram, Q.F., 2000. "PPP Despite Real Shocks: an Empirical Analysis of the Norwegian Real Exchange Rate," Economics Series Working Papers 9930, University of Oxford, Department of Economics.
  25. Cheung, Yin-Wong & Lai, Kon S., 2000. "On the purchasing power parity puzzle," Journal of International Economics, Elsevier, vol. 52(2), pages 321-330, December.
  26. Mark, Nelson C, 1995. "Exchange Rates and Fundamentals: Evidence on Long-Horizon Predictability," American Economic Review, American Economic Association, vol. 85(1), pages 201-18, March.
  27. Hooker, Mark A., 1996. "What happened to the oil price-macroeconomy relationship?," Journal of Monetary Economics, Elsevier, vol. 38(2), pages 195-213, October.
  28. Holden, Steinar & Vikoren, Birger, 1994. " Interest Rates in the Nordic Countries: Evidence Based on Devaluation Expectations," Scandinavian Journal of Economics, Wiley Blackwell, vol. 96(1), pages 15-30.
  29. Serletis, Apostolos & Zimonopoulos, Grigorios, 1997. "Breaking Trend Functions in Real Exchange Rates: Evidence from Seventeen OECD Countries," Journal of Macroeconomics, Elsevier, vol. 19(4), pages 781-802, October.
  30. Cuddington, John T. & Liang, Hong, 2000. "Purchasing power parity over two centuries?," Journal of International Money and Finance, Elsevier, vol. 19(5), pages 753-757, October.
  31. Ratna Sahay & Luis Felipe Céspedes & Paul Cashin, 2002. "Keynes, Cocoa, and Copper; In Search of Commodity Currencies," IMF Working Papers 02/223, International Monetary Fund.
  32. Holmes, Mark J., 2001. "New Evidence on Real Exchange Rate Stationarity and Purchasing Power Parity in Less Developed Countries," Journal of Macroeconomics, Elsevier, vol. 23(4), pages 601-614, October.
  33. Corden, W Max & Neary, J Peter, 1982. "Booming Sector and De-Industrialisation in a Small Open Economy," Economic Journal, Royal Economic Society, vol. 92(368), pages 825-48, December.
  34. Johansen, Soren, 1988. "Statistical analysis of cointegration vectors," Journal of Economic Dynamics and Control, Elsevier, vol. 12(2-3), pages 231-254.
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