'Aggregation Bias' Does Explain the PPP Puzzle
'Aggregation Bias' Does Explain the PPP Puzzle

Author: Jean Imbs

Publisher:

Published: 2005

Total Pages: 48

ISBN-13:

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"This article summarizes our views on the role of an "aggregation bias" in explaining the PPP (i.e. purchasing power parity) Puzzle, in response to the several papers recently written in reaction to our initial contribution. We discuss in particular the criticisms of Imbs, Mumtaz, Ravn and Rey (2002) presented in Chen and Engel (2005). We show that their contentions are based on: (i) analytical counter-examples which are not empirically relevant; (ii) simulation results minimizing the extent of "aggregation bias"; (iii) unfounded claims on the impact of measurement errors on our results; and (iv) problematic implementation of small-sample bias corrections. We conclude, as in our original paper, that "aggregation bias" goes a long way towards explaining the PPP puzzle"--National Bureau of Economic Research web site.

Does "aggregation Bias" Explain the PPP Puzzle?
Does

Author: Shiu-Sheng Chen

Publisher:

Published: 2004

Total Pages: 54

ISBN-13:

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"Recently, Imbs et. al. (2002) have claimed that much of the purchasing power parity puzzle can be explained by 'aggregation bias'. This paper re-examines aggregation bias. First, it clarifies the meaning of aggregation bias and its applicability to the PPP puzzle. Second, the size of the 'bias' is shown to be much smaller than the simulations in Imbs et. al. (2002) suggest, if we rule out explosive roots in the simulations. Third, we show that the presence of non-persistent measurement error especially in the Imbs et. al. (2002) data can make price series appear less persistent than they really are. Finally, it is now standard to recognize that small-sample bias plagues estimates of speeds of convergence of PPP. After correcting small sample bias by methods proposed by Kilian (1998) and by So and Shin (1999), the half-life estimates indicate that heterogeneity and aggregation bias do not help to solve the PPP puzzle"--NBER website

PPP Strikes Back
PPP Strikes Back

Author: Mr. Haroon Mumtaz

Publisher: International Monetary Fund

Published: 2003-04-01

Total Pages: 43

ISBN-13: 1451895534

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We show the importance of a dynamic aggregation bias in accounting for the PPP puzzle. We prove that established time-series and panel methods substantially exaggerate the persistence of real exchange rates because of heterogeneity in the dynamics of disaggregated relative prices. When heterogeneity is properly taken into account, estimates of the real exchange rate half-life fall dramatically, to little more than one year, or significantly below Rogoff''s "consensus view" of three to five years. We show that corrected estimates are consistent with plausible nominal rigidities, thus, arguably, solving the PPP puzzle.

Exchange Rate Economics
Exchange Rate Economics

Author: Ronald MacDonald

Publisher: Psychology Press

Published: 2007

Total Pages: 465

ISBN-13: 0415125510

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This book examines the influence of fiscal policy on exchange rates, recent development in the econometric modelling of exchange rates, and exchange rate modelling for developing countries.

Exchange Rates and Macroeconomic Dynamics
Exchange Rates and Macroeconomic Dynamics

Author: P. Karadeloglou

Publisher: Springer

Published: 2008-02-13

Total Pages: 255

ISBN-13: 0230582699

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This book looks at the PPP persistence puzzle, and econometric aspects of exchange rate dynamics and their implications. It also explores the importance of exchange rate dynamics in the pass-through effects (PTE) and the econometric aspects of the exchange rates dynamics linked to structural shocks on different economies.

Purchasing Power Parity and Real Exchange Rates
Purchasing Power Parity and Real Exchange Rates

Author: Mark P. Taylor

Publisher: Routledge

Published: 2013-09-13

Total Pages: 227

ISBN-13: 1317988205

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The term Purchasing Power Parity may date from the early twentieth century, when it was coined by the Swedish economist Gustav Cassel, but the underlying concept had been enjoying varying degrees of success since its development in sixteenth century Spain. Even towards the end of the twentieth century, and especially since the breakdown of the Bretton Woods system of fixed exchange rates, PPP and the stability of real exchange rates continued to be the subject of academic debate. This volume brings together essays covering aspects of current thinking on Purchasing Power Parity, from the various ways in which to test for its existence, to its appearance in different economies around the world, to examinations of the explanations given when PPP does not appear to hold This book was published as a special issue of Applied Financial Economics. The academic editor of this journal is Mark P. Taylor.

Exchange Rate Economics
Exchange Rate Economics

Author: Ronald MacDonald

Publisher: Routledge

Published: 2005

Total Pages: 334

ISBN-13: 1134838220

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''In summary, the book is valuable as a textbook both at the advanced undergraduate level and at the graduate level. It is also very useful for the economist who wants to be brought up-to-date on theoretical and empirical research on exchange rate behaviour.'' ""Journal of International Economics""

PPP Strikes Back
PPP Strikes Back

Author: Mr.Jean Imbs

Publisher: International Monetary Fund

Published: 2003-04-01

Total Pages: 43

ISBN-13: 145184901X

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We show the importance of a dynamic aggregation bias in accounting for the PPP puzzle. We prove that established time-series and panel methods substantially exaggerate the persistence of real exchange rates because of heterogeneity in the dynamics of disaggregated relative prices. When heterogeneity is properly taken into account, estimates of the real exchange rate half-life fall dramatically, to little more than one year, or significantly below Rogoff's "consensus view" of three to five years. We show that corrected estimates are consistent with plausible nominal rigidities, thus, arguably, solving the PPP puzzle.

The Equity Home Bias Puzzle
The Equity Home Bias Puzzle

Author: Ian Cooper

Publisher:

Published: 2013

Total Pages: 133

ISBN-13: 9781601987631

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Home bias - the empirical phenomenon that investors assign anomalously high weights to their own domestic assets - has puzzled academics for decades: financial theory predicts that an internationally well diversified portfolio of stocks and short-term bonds can reduce risk significantly without affecting expected return. Although the globalization of international equity markets has increased international investments, equity portfolios remain severely home biased today, and no single explanation seems to solve the puzzle completely. In this paper, we first provide a thorough description of the equity home bias phenomenon by defining, discussing, and applying the competing measures and presenting some estimates of the costs of under-diversification. Second, we evaluate the explanations for the equity home bias proposed in the literature such as information asymmetries, behavioral aspects, barriers to foreign investment, and governance issues, and conclude that each explanation on its own falls short, suggesting that the equity home bias probably reflects a combination of factors. Lastly, we review the implications of international under-diversification for portfolio formation and the cost of capital of companies.

Forecasting and Hedging in the Foreign Exchange Markets
Forecasting and Hedging in the Foreign Exchange Markets

Author: Christian Ullrich

Publisher: Springer Science & Business Media

Published: 2009-05-30

Total Pages: 206

ISBN-13: 3642004954

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Historical and recent developments at international ?nancial markets show that it is easy to loose money, while it is dif?cult to predict future developments and op- mize decision-making towards maximizing returns and minimizing risk. One of the reasons of our inability to make reliable predictions and to make optimal decisions is the growing complexity of the global economy. This is especially true for the f- eign exchange market (FX market) which is considered as one of the largest and most liquid ?nancial markets. Its grade of ef?ciencyand its complexityis one of the starting points of this volume. From the high complexity of the FX market, Christian Ullrich deduces the - cessity to use tools from machine learning and arti?cial intelligence, e.g., support vector machines, and to combine such methods with sophisticated ?nancial mod- ing techniques. The suitability of this combination of ideas is demonstrated by an empirical study and by simulation. I am pleased to introduce this book to its - dience, hoping that it will provide the reader with interesting ideas to support the understanding of FX markets and to help to improve risk management in dif?cult times. Moreover, I hope that its publication will stimulate further research to contribute to the solution of the many open questions in this area.