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On PPP, Unit Roots and Panels

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  • Wagner, Martin

    (Department of Economics and Finance, Institute for Advanced Studies, Vienna, Austria)

Abstract

This paper re-assesses the panel (unit root test) evidence for PPP on four monthly data sets. We discuss and illustrate that commonly-used first generation panel unit root tests are inappropriate for PPP analysis since they are constructed for cross-sectionally uncorrelated panels. Given that real exchange rate panel data sets are – almost by construction – highly cross-sectionally correlated, so called second generation panel unit root methods that allow for and model cross-sectional dependence should be applied. Using inappropriate first generation tests, quite strong evidence for PPP is found. However, this evidence vanishes entirely when resorting to an appropriate method (e.g. the one developed in Bai and Ng, 2004a) for nonstationary cross-sectionally correlated panels. We strongly believe that our findings are relevant beyond the data sets investigated here for illustration.

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File URL: http://www.ihs.ac.at/publications/eco/es-176.pdf
File Function: First version, 2005
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Paper provided by Institute for Advanced Studies in its series Economics Series with number 176.

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Date of creation: Sep 2005
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Handle: RePEc:ihs:ihsesp:176
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Keywords: PPP; Real exchange rate index; Unit root; Panel; Cross-sectional dependence; Factor model;

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Find related papers by JEL classification:
  • C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data; Spatio-temporal Models
  • F30 - International Economics - - International Finance - - - General
  • F31 - International Economics - - International Finance - - - Foreign Exchange

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Cited by:

  1. Markus Eberhardt & Christian Helmers & Hubert Strauss, . "Do Spillovers Matter When Estimating Private Returns to R&D?," Discussion Papers 11/22, University of Nottingham, GEP.
  2. Wagner, Martin, 2008. "The carbon Kuznets curve: A cloudy picture emitted by bad econometrics?," Resource and Energy Economics, Elsevier, vol. 30(3), pages 388-408, August.
  3. Miguel de Carvalho & Paulo Julio, 2010. "Digging Out the PPP Hypothesis: an Integrated Empirical Coverage," GEE Papers 0024, Gabinete de Estratégia e Estudos, Ministério da Economia e da Inovação, revised Sep 2010.
  4. Månsson, Kristofer & Sjölander, Pär, 2014. "Testing for nonlinear panel unit roots under cross-sectional dependency — With an application to the PPP hypothesis," Economic Modelling, Elsevier, vol. 38(C), pages 121-132.
  5. Helmut Herwartz & Florian Siedenburg, 2010. "A New Approach to Unit Root Testing," Computational Economics, Society for Computational Economics, vol. 36(4), pages 365-384, December.
  6. Jorg Breitung & Gianluca Cubadda, 2009. "Testing for cointegration in high-dimensional systems," CEIS Research Paper 148, Tor Vergata University, CEIS, revised 30 Sep 2009.
  7. Wagner, Martin, 2005. "The Balassa-Samuelson Effect in 'East & West'. Differences and Similarities," Economics Series 180, Institute for Advanced Studies.
  8. García Solanes, José & Torrejón-Flores, Fernando, 2009. "The Balassa-Samuelson Hypothesis in Developed Countries and Emerging Market Economies: Different Outcomes Explained," Economics - The Open-Access, Open-Assessment E-Journal, Kiel Institute for the World Economy, vol. 3, pages 1-24.
  9. Syed A. Basher & Josep Lluis Carrión-i-Silvestre, 2008. "Deconstructing Shocks and Persistence in OECD Real Exchange Rates," Working Papers XREAP2008-06, Xarxa de Referència en Economia Aplicada (XREAP), revised Jun 2008.
  10. Herwartz, Helmut & Siedenburg, Florian, 2009. "A new approach to unit root testing," Economics Working Papers 2009,06, Christian-Albrechts-University of Kiel, Department of Economics.
  11. José García-Solanes & Francisco I. Sancho-Portero & Fernando Torrejón-Flores, 2007. "Beyond the Salassa-Samuelson Effect in some New Member States of the European Union," CESifo Working Paper Series 1886, CESifo Group Munich.
  12. Castrén, Olli & Osbat, Chiara & Sydow, Matthias, 2006. "What drives investors’ behaviour in different FX market segments? A VAR-based return decomposition analysis," Working Paper Series 0706, European Central Bank.
  13. Smeekes Stephan, 2011. "Bootstrap Sequential Tests to Determine the Stationary Units in a Panel," Research Memorandum 003, Maastricht University, Maastricht Research School of Economics of Technology and Organization (METEOR).

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