RT Report T1 Non-linear adjustment to purchasing power parity: an analysis using Fourier approximations A1 Jiménez Martín, Juan Ángel A1 Robles Fernández, María Dolores AB This paper estimates the dynamics of adjustment to long run purchasing power parity (PPP) using data for 18 mayor bilateral US dollar exchange rates, over the post-Bretton Woods period, in a non-linear framework. We use new unit root and cointegration tests that do not assume a specific non-linear adjustment process. Using a first-order Fourier approximation, we find evidence of non-linear mean reversion in deviations from both absolute and relative PPP. This first-order Fourier approximation allows us to capture many features of the nonlinear decay detected in the data. Our results are consistent with theoretical arguments oninternational goods markets arbitrage under transaction costs as well as with an emerging strand of empirical literature. In this sense, this paper contributes towards forming a consensus on the presence of nonzero transaction costs across a broad range of countries. PB Instituto Complutense de Análisis Económico. Universidad Complutense de Madrid SN 2341-2356 YR 2005 FD 2005 LK https://hdl.handle.net/20.500.14352/56629 UL https://hdl.handle.net/20.500.14352/56629 LA eng DS Docta Complutense RD 7 abr 2025