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.

'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.

A Prism Into the PPP Puzzles
A Prism Into the PPP Puzzles

Author: David C. Parsley

Publisher:

Published: 2004

Total Pages: 64

ISBN-13:

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"The real exchange rate (RER) has been called the single most important price, yet its behavior exhibits several puzzles. In this project, we use Big Mac prices as a unique prism to study the movement of real exchange rates. Part of our innovation is to match these prices to the prices of individual ingredients. There are a number of advantages associated with our approach. First, unlike the CPI RER, we can measure the Big Mac RER in levels. Second, unlike the CPI RER, for which the attribution to tradable and non-tradable components involves assumptions on the weights and the functional form, we (almost) know the exact composition of a Big Mac, and can estimate the tradable and non-tradable components relatively precisely. Third, we can study the dynamics of the RER in a setting free of: the product-aggregation bias, the temporal aggregation bias, and the bias generated by non-compatible consumption baskets across countries. Fourth that Engel's result that deviations from the law of one price are sole explanation for RER movements does not hold generally. We offer some evidence that departure from the Engel effect can be systematically linked to economic factors"--NBER website

Currencies, Commodities and Consumption
Currencies, Commodities and Consumption

Author: Kenneth W. Clements

Publisher: Cambridge University Press

Published: 2013-01-31

Total Pages: 401

ISBN-13: 110701476X

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Discusses economic issues associated with exchange rates, commodity prices, the economic size of countries and alternatives to PPP exchange rates.

Exchange Rates in South America's Emerging Markets
Exchange Rates in South America's Emerging Markets

Author: Luis Molinas Sosa

Publisher: Cambridge University Press

Published: 2020-07-16

Total Pages: 55

ISBN-13: 1108897924

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Since Meese and Rogoff (1983) results showed that no model could outperform a random walk in predicting exchange rates. Many papers have tried to find a forecasting methodology that could beat the random walk, at least for certain forecasting periods. This Element compares the Purchasing Power Parity, the Uncovered Interest Rate, the Sticky Price, the Bayesian Model Averaging, and the Bayesian Vector Autoregression models to the random walk benchmark in forecasting exchange rates between most South American currencies and the US Dollar, and between the Paraguayan Guarani and the Brazilian Real and the Argentinian Peso. Forecasts are evaluated under the criteria of Root Mean Square Error, Direction of Change, and the Diebold-Mariano statistic. The results indicate that the two Bayesian models have greater forecasting power and that there is little evidence in favor of using the other three fundamentals models, except Purchasing Power Parity at longer forecasting horizons.

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""