The Dollar Exchange Rate, Adjustment to the Purchasing Power Parity, and the Interest Rate Differential

Michael Frömmel, Darko B. Vukovic and Jinyuan Wu
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Darko B. Vukovic: Graduate School of Management, Saint Petersburg State University, Volkhovskiy Pereulok 3, 199004 Saint Petersburg, Russia
Jinyuan Wu: Department of Economics, Ghent University, Sint Pietersplein 5, 9000 Ghent, Belgium

Mathematics, 2022, vol. 10, issue 23, 1-17

Abstract: This study applies a Markov switching error correction model to describe the single most important real exchange rate (Deutsche mark versus US dollar) over the flexible exchange rates period from 1973 to 2004. We show an alternative way of modelling non-linear adjustment to the purchasing power parity (PPP) besides standard threshold models. The model merges the two possible sources of non-linearity by additionally allowing the probability of a mean-reverting regime to increase with the distance from PPP. The interest rate differential as an additional determinant of real exchange rate behaviour in a Markov switching framework is introduced in the model. The study finds that the real dollar exchange rate during the post-Bretton Woods era is well described by a Markov switching error correction model with (PPP) as long-run equilibrium. There is one mean reversion regime where PPP and the interest parity condition are valid. Contrary, the second regime is characterised by persistent mean aversion, where a regime switch does not become more likely with increasing distance from PPP. The unconditional half-life of shocks is about 1.5 years.

Keywords: real exchange rate modelling; purchasing power parity; interest rate differentials; Markov switching model; non-linearities; error correction model (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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