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Does Purchasing Power Parity Work?

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  • Michael R. Darby

Abstract

The logarithm of the purchasing power ratio (PPR) is shown for seven countries and three alternative price indices to follow a stationary and invertible process in the first differences. This means that permanent shifts in the parity value accumulate over time. Therefore, as the prediction interval lengthens, the variance of the level of the PPR goes towards infinity while the variance of its average growth rate goes to zero. Since the variance of the permanent shifts is substantial: (1) Harmonized money growth cannot maintain constant exchange rates; reserve flows feedback is required. (2) Economic explanations of the permanent shifts are an important research topic.

Suggested Citation

  • Michael R. Darby, 1980. "Does Purchasing Power Parity Work?," NBER Working Papers 0607, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:0607
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    1. Michael R. Darby & James R. Lothian & Arthur E. Gandolfi & Anna J. Schwartz & Alan C. Stockman, 1983. "II. The Mark III International Transmission Model," NBER Chapters, in: The International Transmission of Inflation, pages 83-84, National Bureau of Economic Research, Inc.
    2. Darby, Michael R, 1975. "The Financial and Tax Effects of Monetary Policy on Interest Rates," Economic Inquiry, Western Economic Association International, vol. 13(2), pages 266-276, June.
    3. Plosser, Charles I. & Schwert, G. William, 1977. "Estimation of a non-invertible moving average process : The case of overdifferencing," Journal of Econometrics, Elsevier, vol. 6(2), pages 199-224, September.
    4. Bela Balassa, 1964. "The Purchasing-Power Parity Doctrine: A Reappraisal," Journal of Political Economy, University of Chicago Press, vol. 72(6), pages 584-584.
    5. Dooley, Michael P & Isard, Peter, 1980. "Capital Controls, Political Risk, and Deviations from Interest-Rate Parity," Journal of Political Economy, University of Chicago Press, vol. 88(2), pages 370-384, April.
    6. Jacob A. Frenkel, 1980. "Flexible Exchange Rates in the 1970's," NBER Working Papers 0450, National Bureau of Economic Research, Inc.
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    Citations

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    1. Ronald MacDonald, 1985. "Are deviations from purchasing power parity efficient? Some further answers," Review of World Economics (Weltwirtschaftliches Archiv), Springer;Institut für Weltwirtschaft (Kiel Institute for the World Economy), vol. 121(4), pages 638-645, December.
    2. Andrew Phiri, 2017. "Nonlinear adjustment effects in the purchasing power parity," Journal of Economics and Econometrics, Economics and Econometrics Society, vol. 60(2), pages 14-38.
    3. Frankel, Jeffrey A. & Rose, Andrew K., 1996. "A panel project on purchasing power parity: Mean reversion within and between countries," Journal of International Economics, Elsevier, vol. 40(1-2), pages 209-224, February.
    4. Charles Pigott, 1981. "The influence of real factors on exchange rates," Economic Review, Federal Reserve Bank of San Francisco, issue Fall, pages 37-54.
    5. Kamrul Hassan & Ruhul Salim, 2011. "The linkage between relative population growth and purchasing power parity," International Journal of Development Issues, Emerald Group Publishing Limited, vol. 10(2), pages 154-169, July.
    6. Razzaque Bhatti & Imad Moosa, 1994. "A new approach to testing ex ante purchasing power parity," Applied Economics Letters, Taylor & Francis Journals, vol. 1(9), pages 148-151.
    7. repec:onb:oenbwp:y::i:28:b:1 is not listed on IDEAS
    8. John Pippenger, 1986. "Arbitrage and efficient markets interpretations of purchasing power parity: theory and evidence," Economic Review, Federal Reserve Bank of San Francisco, issue Win, pages 31-47.
    9. Sundar, Cuddalore & Varela, Oscar & Naka, Atsuyuki, 1997. "Black market and official exchange rates, cointegration and purchasing power parity in developing Asian countries," Global Finance Journal, Elsevier, vol. 8(2), pages 221-238.
    10. Daniel Gros, 1989. "On the volatility of exchange rates: Tests of monetary and portfolio balance models of exchange rate determination," Review of World Economics (Weltwirtschaftliches Archiv), Springer;Institut für Weltwirtschaft (Kiel Institute for the World Economy), vol. 125(2), pages 273-295, June.
    11. Thomas L Bradley & Paul B Eberle, 2023. "Purchasing Power Parity In Russia And The Transitioning Economy 1990-1995," Review of Economic and Business Studies, Alexandru Ioan Cuza University, Faculty of Economics and Business Administration, issue 31, pages 85-111, June.
    12. Jeffrey A. Frankel & Kenneth A. Froot, 1985. "Using Survey Data to Test Some Standard Propositions Regarding Exchange Rate Expectations," NBER Working Papers 1672, National Bureau of Economic Research, Inc.
    13. Ntokozo Patrick Nzimande & Marcel Kohler, 2016. "On the Validity of Purchasing Power Parity: Evidence from Energy Exporting Sub-Saharan Africa Countries," SPOUDAI Journal of Economics and Business, SPOUDAI Journal of Economics and Business, University of Piraeus, vol. 66(3), pages 71-82, July-Sept.
    14. Hakkio, Craig S., 1984. "A re-examination of purchasing power parity : A multi-country and multi-period study," Journal of International Economics, Elsevier, vol. 17(3-4), pages 265-277, November.
    15. repec:kap:iaecre:v:14:y:2008:i:1:p:11-24 is not listed on IDEAS
    16. Mauro S. Ferreira, 2007. "Capturing asymmetry in real exchange rate with quantile autoregression," Textos para Discussão Cedeplar-UFMG td306, Cedeplar, Universidade Federal de Minas Gerais.
    17. Phiri, Andrew, 2014. "Purchasing power parity (PPP) between South Africa and her main currency exchange partners: Evidence from asymmetric unit root tests and threshold co-integration analysis," MPRA Paper 53659, University Library of Munich, Germany.
    18. Katja Funke & Isabell Koske, 2008. "Does the Law of One Price Hold within the EU? A Panel Analysis," International Advances in Economic Research, Springer;International Atlantic Economic Society, vol. 14(1), pages 11-24, February.
    19. Cuddalore Sundar, 1994. "Impact of trade on purchasing power parity in black market and official exchange rates," Applied Economics Letters, Taylor & Francis Journals, vol. 1(5), pages 69-73.
    20. Gouriéroux, Christian & Peaucelle, Irina, 1992. "Séries codépendantes : application à l’hypothèse de parité du pouvoir d’achat," L'Actualité Economique, Société Canadienne de Science Economique, vol. 68(1), pages 283-304, mars et j.
    21. Mauro Ferreira, 2011. "Capturing asymmetry in real exchange rate with quantile autoregression," Applied Economics, Taylor & Francis Journals, vol. 43(3), pages 327-340.

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