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Quantifying the Half-Life of Deviations from PPP: The Role of Economic Priors

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Author Info
Kilian, Lutz
Zha, Tao

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Abstract

The half-life of deviations from purchasing power parity (PPP) plays a central role in the ongoing debate about the ability of macroeconomic models to account for the time series behaviour of the real exchange rate. The main contribution of this paper is a general framework in which alternative priors for the half-life of deviations from PPP can be examined. We show how to incorporate formally the prior views of economists about the half-life. In our empirical analysis we provide two examples of such priors. One example is a consensus prior consistent with widely held views among economists with a professional interest in the PPP debate. The other example is a relatively diffuse prior designed to capture a large degree of uncertainty about the half-life. Our methodology allows us to make explicit probability statements about the half-life and to assess the likelihood that the half-life exceeds a given number of years, without taking a stand on whether the data have a unit root or not. We find only very limited support for the common view in the PPP literature that the half-life is between three and five years.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 2334.

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Date of creation: Dec 1999
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Handle: RePEc:cpr:ceprdp:2334

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Related research
Keywords: Half-Life; Likelihood; Mean Reversion; Persistence; Purchasing Power Parity;

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Find related papers by JEL classification:
C11 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: General - - - Bayesian Analysis
C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions
F31 - International Economics - - International Finance - - - Foreign Exchange
F41 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Open Economy Macroeconomics

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(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Qian Chen & David E. Giles, 2007. "A Saddlepoint Approximation to the Distribution of the Half-Life Estimator in an Autoregressive Model: New Insights Into the PPP Puzzle," Econometrics Working Papers 0703, Department of Economics, University of Victoria. [Downloadable!]
  2. Chan, Tze-Haw & Khong, Wye Leong Roy & Baharumshah, Ahmad Zubaidi, 2003. "Dynamic Financial Linkages of Japan and ASEAN Economies: An Application of Real Interest Parity," MPRA Paper 2209, University Library of Munich, Germany, revised 2003. [Downloadable!]
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