Jyh-Lin Wu

Institute of Economics
National Sun Yat-sen University
70 Lien-hai Rd.
Kaohsiung, Taiwan


NBER Working Papers and Publications

August 2017Identifying Exchange Rate Common Factors
with Ryan Greenaway-McGrevy, Donggyu Sul, Nelson Mark: w23726
Using recently developed model selection procedures, we determine that exchange rate returns are driven by a two-factor model. We identify them as a dollar factor and a euro factor. Exchange rates are thus driven by global, US, and Euro-zone stochastic discount factors. The identified factors can also be given a risk-based interpretation. Identification motivates multilateral models for bilateral exchange rates. Out-of-sample forecast accuracy of empirically identified multilateral models dominate the random walk and a bilateral purchasing power parity fundamentals prediction model. 24-month ahead forecast accuracy of the multilateral model dominates those of a principal components forecasting model.
February 2016Conditional PPP and Real Exchange Rate Convergence in the Euro Area
with Paul R. Bergin, Reuven Glick: w21979
While economic theory highlights the usefulness of flexible exchange rates in promoting adjustment in international relative prices, flexible exchange rates also can be a source of destabilizing shocks. We find that when countries joining the euro currency union abandoned their national exchange rates, the adjustment of real exchange rates toward purchasing power parity (PPP) became faster. To disentangle the possible causes for this finding we develop a novel methodology for conducting counterfactual simulations of an estimated VECM that distinguishes between the roles of the nominal exchange rate as an adjustment mechanism and as a source of shocks. We find evidence that prior to joining the euro currency union, member countries relied upon exchange rate adjustments as a mechanism to cor...

Published: Bergin, Paul R. & Glick, Reuven & Wu, Jyh-Lin, 2017. "“Conditional PPP” and real exchange rate convergence in the euro area," Journal of International Money and Finance, Elsevier, vol. 73(PA), pages 78-92. citation courtesy of

August 2012Mussa Redux and Conditional PPP
with Paul R. Bergin, Reuven Glick: w18331
Long half-lives of real exchange rates are often used as evidence against monetary sticky price models. In this study we show how exchange rate regimes alter the long-run dynamics and half-life of the real exchange rate, and we recast the classic defense of such models by Mussa (1986) from an argument based on short-run volatility to one based on long-run dynamics. The first key result is that the extremely persistent real exchange rate found commonly in post Bretton Woods data does not apply to the preceding fixed exchange rate period in our sample, where the half-live was perhaps half as large. This result suggests a reinterpretation of Mussa's original finding, indicating that up to two thirds of the rise in variance of the real exchange rate in the recent period is actually due to the...

Published: Bergin, Paul R. & Glick, Reuven & Wu, Jyh-Lin, 2014. "Mussa redux and conditional PPP," Journal of Monetary Economics, Elsevier, vol. 68(C), pages 101-114. citation courtesy of

December 2009The Micro-Macro Disconnect of Purchasing Power Parity
with Paul R. Bergin, Reuven Glick: w15624
This paper reconciles the persistence of aggregate real exchange rates with the faster adjustment of international relative prices in microeconomic data. Panel estimation of an error correction model using a micro data set uncovers new stylized facts regarding this puzzle. First, adjustment to purchasing power parity deviations in aggregated data is not just a slower version of adjustment to the law of one price in microeconomic data, as arbitrage occurs in different markets, in response to distinct macroeconomic and microeconomic shocks. Second, when half-lives are estimated conditional on macro shocks, micro relative prices exhibit just as much persistence as aggregate real exchange rates. These results challenge theories of real exchange rate persistence based on sticky prices and on he...

Published: Paul R. Bergin & Reuven Glick & Jyh-Lin Wu, 2013. "The Micro-Macro Disconnect of Purchasing Power Parity," The Review of Economics and Statistics, MIT Press, vol. 95(3), pages 798-812, July. citation courtesy of

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