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We examine the mean-reverting properties of real exchange rates, by comparing the unit root properties of a group of international real exchange rates with two groups of intra-national real exchange rates. Strikingly, we find that while the international real rates taken as a group appear mean-reverting, the intra-national rates are not. This is consistent with the view that while monetary shocks may be mean-reverting over the medium term, underlying real factors do generate long-term trends in real exchange rates.
We explore deviations from short-run purchasing power parity across European cities, attempting to move beyond a "first-generation" of papers that document very large border effects. We document two very distinct types of border effects embedded in relative prices. The first is a "real barriers effect," caused by various barriers to market integration. The second is a sticky-consumer-price cum volatile exchange-rate effect. Both are shown to be important empirically, the second type especially so. We argue that the two effects are very different from each other. For the first type of effect, it is clear that border effects imply deadweight welfare losses. We argue that while the second type of border effect could be eliminated with fixed exchange rates, welfare is not necessarily increased
Evolution of PPP theory; Modern PPP theory and practice; Selected PPP studies.
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.
In this paper we develop and test two hypotheses about purchasing power parity (PPP) derived from the pricing behavior of profit- maximizing, exporting firms. The first is that changes in the price of traded goods relative to domestic substitutes, due to partial pass- through of exchange rates, will affect the PPP relation. The second is that PPP should hold on forward rather than spot exchange rates, due to hedging by firms. Using quarterly data for the United States, Canada, France, Germany, Japan and the United Kingdom, we find considerable support for the first but not the second hypothesis.
Univariate studies of the hypothesis of unit roots in real exchange rates have yielded consensus point estimates of the half-life of deviations from purchasing power parity of between three to five years. However, least squares-based estimates of half-lives are biased downward. Accordingly, we follow Andrews (1993) and use median-unbiased estimators of the half-life of deviations from parity as a preferred measure of the persistence of real exchange rate shocks. We study this issue using real effective exchange rate (REER) data for 22 industrial countries in the post-Bretton Woods period. Three methods of bias correction are implemented, which yield cross-country averages of half-lives of deviations from parity ranging between 4 to 15 years, with the REER of several countries displaying permanent deviations from parity.
Previous time-series studies have shown evidence of mean- reversion in real exchange rates. Deviations from purchasing power parity (PPP) appear to have half-lives of approximately four years. However, the long samples required for statistical significance are unavailable for most currencies, and may be inappropriate because of regime changes. In this study, we re-examine deviations from PPP using a panel of 150 countries and 45 annual observations. Our panel shows strong evidence of mean-reversion that is similar to that from long time-series. PPP deviations are eroded at a rate of approximately 15% annually, i.e., their half-life is around four years. Such findings can be masked in time-series data, but are relatively easy to find in cross-sections.
This paper introduces a time-varying threshold autoregressive model (TVTAR), which is used to examine the persistence of deviations from PPP. We find support for the stationary TVTAR against the unit root hypothesis; however, for some developing countries, we do not reject the TVTAR with a unit root in the corridor regime. We calculate magnitudes, frequencies, and durations of the deviations of exchange rates from forecasted changes in exchange rates. A key result is asymmetric adjustment. In developing countries, the average cumulative deviation from forecasts during periods when exchange rates are below forecasts is twice the corresponding measure during periods when exchange rates are above forecasts.
Seminar paper from the year 2008 in the subject Business economics - Miscellaneous, grade: A, Schmalkalden University of Applied Sciences (Schmalkalden University), language: English, abstract: "Under the skin of any international economist lies a deep-seated belief in some variant of the PPP theory of the exchange rate." The purpose of this paper is to consider one of the most controversial theory in international economics - Purchasing Power Parity theory - its main idea, empirical evidence, limitations and practical application. The main idea of PPP is price levels changes determine the exchange rate change between two countries. There are two versions of PPP theory absolute and relative. Stricter absolute version of PPP did not find confirmation in reality and relative version of PPP theory was proposed. Despite theoretical and practical inconformity, PPP is present in many models of international economics as an explanation of exchange rate changes. The main apologist of PPP theory and its father was Gustav Cassel. He indicated that the exchange rate determined by price levels is not necessarily the actual exchange rate but the equilibrium one. Also Cassel mentioned that there is a tendency for the actual exchange rate to return to its equilibrium exchange rate. The original idea of PPP theory is described below: "Our willingness to pay a certain price for foreign money must ultimately and essentially be due to the fact that this money possesses a purchasing power as against commodities and services in that foreign country." In this paper we considered the principle and two versions of PPP theory, discussed its empirical evidence and econometrical tests, and also tried to find possible reasons why PPP theory fails in reality and answered the question is this theory still useful for explaining exchange rates movements.