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Does 'Aggregation Bias' Explain The Ppp Puzzle?

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  • Shiu-Sheng Chen
  • Charles Engel

Abstract

Recently, Jean Imbs and colleagues have claimed that much of the purchasing power parity puzzle can be explained by 'aggregation bias'. This paper re-examines aggregation bias. It clarifies the meaning of aggregation bias and its applicability to the PPP puzzle; demonstrates that the size of the 'bias' is much smaller than suggested if explosive roots in the simulations are ruled out; and shows that the presence of non-persistent measurement error data can make price series appear less persistent than they are. After correcting for small-sample bias, half-life estimates indicate that heterogeneity and aggregation bias do not help to solve the PPP puzzle. Copyright 2005 Blackwell Publishing Ltd

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Bibliographic Info

Article provided by Wiley Blackwell in its journal Pacific Economic Review.

Volume (Year): 10 (2005)
Issue (Month): 1 (02)
Pages: 49-72

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Handle: RePEc:bla:pacecr:v:10:y:2005:i:1:p:49-72

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  1. Charles Engel, 1999. "Local-Currency Pricing and the Choice of Exchange-Rate Regime," Discussion Papers in Economics at the University of Washington 0036, Department of Economics at the University of Washington.
  2. Andrews, Donald W K & Chen, Hong-Yuan, 1994. "Approximately Median-Unbiased Estimation of Autoregressive Models," Journal of Business & Economic Statistics, American Statistical Association, vol. 12(2), pages 187-204, April.
  3. Lutz Kilian, 1998. "Small-Sample Confidence Intervals For Impulse Response Functions," The Review of Economics and Statistics, MIT Press, vol. 80(2), pages 218-230, May.
  4. Andrews, Donald W K, 1993. "Exactly Median-Unbiased Estimation of First Order Autoregressive/Unit Root Models," Econometrica, Econometric Society, vol. 61(1), pages 139-65, January.
  5. Murray, Christian J. & Papell, David H., 2002. "The purchasing power parity persistence paradigm," Journal of International Economics, Elsevier, vol. 56(1), pages 1-19, January.
  6. Mario J. Crucini & Mototsugu Shintani, 2006. "Persistence in Law-Of-One-Price Deviations: Evidence from Micro-Data," Vanderbilt University Department of Economics Working Papers 0616, Vanderbilt University Department of Economics.
  7. C. John McDermott & Paul Cashin, 2001. "An Unbiased Appraisal of Purchasing Power Parity," IMF Working Papers 01/196, International Monetary Fund.
  8. Jean Imbs & Haroon Mumtaz & Morten Ravn & Hélène Rey, 2005. "PPP Strikes Back: Aggregation and the Real Exchange Rate," The Quarterly Journal of Economics, MIT Press, vol. 120(1), pages 1-43, January.
  9. Christian Murray & David Papell, 2005. "The purchasing power parity puzzle is worse than you think," Empirical Economics, Springer, vol. 30(3), pages 783-790, October.
  10. So, Beong Soo & Shin, Dong Wan, 1999. "Recursive mean adjustment in time-series inferences," Statistics & Probability Letters, Elsevier, vol. 43(1), pages 65-73, May.
  11. Granger, C. W. J., 1980. "Long memory relationships and the aggregation of dynamic models," Journal of Econometrics, Elsevier, vol. 14(2), pages 227-238, October.
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