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Does the PPP need the UIP?

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  • Rodolfo Helg
  • Massimiliano Serati

Abstract

In this paper we focus on the post Bretton Woods period and analyze whether a PPP relationship holds and what is the speed of adjustment to it. We adopt a multivariate system approach in which, initially, we test for cointegration and then we try to identify a cointegration space in which we have the PPP relationship (the "Johansen approach"). The studies that have adopted this approach have always rejected the PPP in favour of a long run relationship between the real exchange rate and the interest rate differential. On the contrary, our conclusions are in favour of the PPP for all the cases considered when we allow for a structural break in the data. We arrive to this conclusion, after having identified the cointegration space in two different ways: one in which we have the PPP as a cointegrated vector and one in which the real exchange rate plus the interest rate differential is a cointegrated vector. Adopting a dominance criterion we choose the former identification. We al so address the Rogoff's (1996) puzzle on the excess volatility of real exchange rate and the slow convergence to PPP. On the basis of persistence profiles obtained from a constrained VECM, we don't find any evidence in favour of the puzzle since we estimate a relatively fast speed of adjustment.

Suggested Citation

  • Rodolfo Helg & Massimiliano Serati, "undated". "Does the PPP need the UIP?," Working Papers 97, IGIER (Innocenzo Gasparini Institute for Economic Research), Bocconi University.
  • Handle: RePEc:igi:igierp:97
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    References listed on IDEAS

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    Cited by:

    1. Hafsa Hina & Abdul Qayyum, 2015. "Re-estimation of Keynesian Model by Considering Critical Events and Multiple Cointegrating Vectors," The Pakistan Development Review, Pakistan Institute of Development Economics, vol. 54(2), pages 123-145.
    2. Hina, Hafsa & Qayyum, Abdul, 2013. "Estimation of Keynesian Exchange Rate Model of Pakistan by Considering Critical Events and Multiple Cointegrating Vectors," MPRA Paper 52611, University Library of Munich, Germany.
    3. Jaramillo Franco, Miguel & Serván Lozano, Sergio, 2012. "Modeling exchange rate dynamics in Peru: A cointegration approach using the UIP and PPP," MPRA Paper 70772, University Library of Munich, Germany.

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