The real exchange rate in sticky-price models: does investment matter?

Working papers set out research in progress by our staff, with the aim of encouraging comments and debate.
Published on 22 April 2009

Working Paper No. 368
By Enrique Martínez-García and Jens Søndergaard

This paper re-examines the ability of sticky-price models to generate volatile and persistent real exchange rates. We use a DSGE framework with pricing to market to illustrate the link between real exchange rate dynamics and what the model assumes about physical capital. We show that adding capital accumulation to the model facilitates consumption smoothing and significantly impedes the model’s ability to generate volatile real exchange rates. Our analysis, therefore, caveats earlier work that has shown how real shocks in a sticky-price model without capital can replicate the observed real exchange rate dynamics. Finally, we find that so-called persistence anomaly remains robust to several alternative capital specifications including set-ups with variable capital utilisation and investment adjustment costs. In summary, the PPP puzzle is still very much alive and well.

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