Static deviations from purchasing-power parity

The paper examines the ‘real’ effects of monetary policy in a small open economy in full stock-flow equilibrium. In the presence of government debt, an increase in the money supply generally produces deviations from purchasing power parity. Money creation through foreign-exchange purchases results in an overvaluation of the domestic currency. While its short-run effects favor the export industries, its long-run effects are thus in favor of the domestic sector. The same is true for open-market purchases, but the overvaluation is probably smaller in this case.     

Natural Exchange Rate and Its Implications for the Purchasing Power Parity Puzzle

The notion of purchasing power parity has been an important building block in the theory of nominal and real exchange rates and for many theoretic models in international economics, leading to the purchasing power parity puzzle. The central issue of the puzzle is how to reconcile volatile short-term movements of real exchange rates (defined as nominal exchange rates adjusted for differences in national price levels) with very slow convergence to the parity condition. The main emphasis of this article is to show that the slow adjustment of the natural exchange rate is responsible for the well-known slow convergence of the real exchange rate to the long-run parity condition. The novel element of this article is to identify the relative importance between the financial channel and output gap channel of the purchasing power parity puzzle. The empirical findings of this article suggest that the financial channel is a dominant factor to explain persistent deviations of the real exchange rate from its long-run level.     

Temporal aggregation and purchasing power parity persistence

This paper uses a unique new monthly US-UK real exchange rate series for the January 1794-December 2009 period to reexamine the academic debate over purchasing power parity (PPP). The consensus view described by Rogoff (1996) is that PPP holds in the long-run, but short-run deviations are very persistent, with half-lives ranging from 3 to 5 years. Most of the literature using long time series relies on the annual data developed by Lee (1976) and Lothian and Taylor (1996), which were both constructed from underlying higher-frequency data sources. Estimates of purchasing power parity persistence using these series may therefore be subject to temporal aggregation bias. We find evidence of aggregation bias which indicates the half-life of PPP deviations has been overestimated in much of the previous literature. We also find that estimates of the half-lives are further reduced once we account for the Harrod (1933)-Balassa (1964)-Samuelson (1964) effect. The result of aggregation bias appears to be robust even when considering the case that real exchange rates exhibit nonlinear dynamics.     

Productivity shocks and real exchange rates

Previous studies have concluded that productivity shocks have negligible effects on real exchange rate fluctuations. This paper shows that when long-run equilibrium relationships between real exchange rate levels and fundamental variables are taken into account, relative productivity shocks account for most of the long-run movements in the real exchange rates. This can be interpreted as empirical support for the Balassa (1964. Journal of Political Economy 72, 584-596) and Samuelson (1964. Review of Economics and Statistics 46, 145-154) model where differences in relative productivity is the main source of long-run deviations for purchasing power parity.     

Black-market exchange-rate expectations and the domestic demand for money: Some empirical results

This paper analyzes the effects of expectations about future exchange-rate adjustments on the demand for money. These effects are studied empirically for the case of countries which have imposed foreign-exchange restrictions. The results obtained for Brazil, Chile, and Colombia indicate that the demand for money is significantly reduced when expectations of black-market depreciation intensify; and that when this variable (for which the proxy used is the divergence of the black-market exchange rate from purchasing power parity) is omitted from the demand-for-money function, the response of the demand for money to changes in the expected rate of domestic inflation tends to be overestimated.     

Price,output, and exchange rate movements in the open economy

Since the advent of managed floating it has come to be accepted as a stylized fact that short-run deviations from purchasing power parity are both substantial and persistent. Two explanations of these deviations have been advanced in the literature. One emphasizes the role of changes in non-traded goods prices while the other views deviations from purchasing power parity as being due to sticky goods prices and slow adjustment of goods markets. This paper presents yet a third possible explanation of deviations from purchasing power parity — they may be necessary in order to facilitate the relative price changes that are required to maintain equilibrium in the face of unanticipated shocks. In addition, the issue of exchange rate overshooting is addressed. Whereas the sticky price models view exchange rate overshooting and exchange rate volatility as symptoms of some fundamental disequilibrium, the perspective taken here is that these events are, in principle, compatible with a world in which all markets clear continuously.     

Currency Risk and Country Risk in International Banking

This paper focuses on the conditions under which banks are subject to currency and country risks on their dollar-denominated loans to foreign firms and governments. We conclude that currency risk is a function of the rates of domestic and foreign inflation, deviations from purchasing power parity, and the effect of these deviations on the firm's and the nation's dollar-equivalent cash flows. Country risk is largely determined by the variability of the nation's terms of trade and the government's willingness to allow the national economy to adjust rapidly to changing economic fortunes.     

Australia’s equity home bias and real exchange rate volatility

The main purpose of this paper is to consider the effect of real exchange rate volatility on equity investment by Australian investors. Equity investment is of major importance to savers and investors in Australia. Also real exchange rate volatility is an important influence on Australia’s financial integration in the global economy. Analysis of the effect of real exchange rate volatility on Australia’s equity home bias is important since Australian dollar is a commodity currency. There is a close relationship between Australia’s terms of trade and real exchange rate volatility. Home bias is measured on the basis of free float-adjusted market capitalization in recognition of the fact that closely held shares are not available to ordinary investors. Real exchange rate volatility is measured by deviations from purchasing power parity on a bilateral basis between Australia and 35 countries. The cross-border equity investment data over the period 2001–2007 are from International Monetary Fund’s Coordinated Portfolio Investment Survey. Australian investors are found to invest significantly less in a country if the real exchange rate volatility of that country is relatively high (results that are robust to standard control measures and generalized method of moments).     

Sharing rules and equilibrium in an international capital market under uncertainty

International capital market equilibrium is characterized for a world economy in which consumption preferences are defined multiplicatively over many commodities. It is shown that the set of relative asset prices under pure exchange in international capital markets depends on the real purchasing power of nominal payoffs under uncertainty and does not depend on the currency in which the nominal payoffs are denominated. A Sharpe-Lintner type international capital asset pricing model is derived as a special case. Proportional ad valorem commodity taxes and transportation costs are incorporated in the valuation model, interest rate parity and purchasing power parity are reinterpreted under uncertainty, and international differences in borrowing and lending are shown to reflect, in part, differences in risk aversion across countries.     

Real exchange rate persistence and monetary policy rules

The objective of this paper is to analyze the effects of alternative monetary rules on real exchange rate persistence. Using a two-country stochastic dynamic general equilibrium with nominal price stickiness and local currency pricing, we will show how the persistence of purchasing power parity deviations can be related to a monetary theory of these deviations. When monetary policy lean against the wind, there is no relationship of proportionality between the time during which prices remain sticky and the persistence of the response of the real exchange rate: in this case high nominal price rigidity is not sufficient, per se, in generating any persistence following a monetary shock. Moreover, we emphasize the role of interest rates smoothing policies and relative price stickiness within countries in understanding the relationship between the real exchange rate and monetary shocks. With reasonable parameters values, a wide range of monetary policy rules can generate real exchange rate autocorrelations around the ones observed in the data.     

Deviations from purchasing power parity under different exchange rate regimes: Do they revert and,if so,how?

We propose an empirical model for deviations from long-run purchasing power parity (PPP) that simultaneously accounts for three key features: (i) adjustment toward PPP may occur via nominal exchange rates and relative prices at different speeds; (ii) different exchange rate regimes may generate regime shifts in the structural dynamics of PPP deviations; (iii) nonlinear reversion toward PPP in response to shocks. This empirical framework encompasses and synthesizes much previous empirical research. Using over a century of data for the G5 countries, we provide evidence that long-run PPP holds, the relative importance of nominal exchange rates and prices in restoring PPP varies over time and across different exchange rate regimes, and reversion to PPP occurs nonlinearly, at a speed that is fairly consistent with the nominal rigidities suggested by conventional open economy models.     

PPP,interest rate parities,and the modified Fisher effect in the presence of tax agreements: A comment

If no taxes exist, perfect mobility and substitutability (international Fisher parity — IF) and purchasing power parity (PPP) result in real interest rate equality. The existence of taxes, however, prevents all three parity relationships from holding simultaneously. Costless financial arbitrage plus costless goods arbitrage are the assumptions of IF and PPP, respectively. If residency arbitrage is expensive, IF and PPP will result in unequal real rates that give no incentive for capital or goods flows. Differences in real rates may come either from differences in income tax rates or from differential inflation.     

An Examination of the Short-Term and Long-Term Behavior of Foreign Exchange Rates

This study employs the heteroskedasticity-robust variance ratio test and the modified rescaled range analysis to examine the short-term and long-term behavior of foreign exchange rates. The empirical results suggest that four of the five weekly nominal exchange rates examined exhibit short-term dependence. Further, there is evidence of long-term dependence in the nominal exchange rate series. The results also indicate that the real exchange rates generally exhibit short-term independence, and the lack of strong evidence in favor of long-term dependence in real exchange rates indicates that the purchasing power parity may not hold in the long run.     

Testing deviations from purchasing power parity

This paper studies analytically how the presence of transportation costs in a model of deviations from purchasing power parity (PPP) affects the testing procedure of the PPP hypothesis. The analysis shows that in the presence of transportation costs traditional regression analysis will tend to reject the PPP hypothesis even if goods markets are well arbitraged, because the values of the regression coefficients are affected systematically by considerations that are independent of the degree to which markets are arbitraged. Thus, the content of the PPP approach cannot be tested satisfactorily without considering the systematic effects of transportation costs and other costs of goods arbitrage.     

Testing the Purchasing Power Parity Hypothesis for the New Member and Candidate Countries of the European Union: Evidence from Lagrange Multiplier Unit Root Tests with Structural Breaks

This paper investigates the validity of purchasing power parity (PPP) for the eleven Central and East European transition countries and three market economy countries, Cyprus, Malta, and Turkey. Unlike previous studies on PPP, this study uses Lagrange multiplier (LM) unit root tests that incorporate structural breaks in the data series. The findings indicate that in cases of one and two structural breaks, for a U.S. dollar-based real exchange rate series, there is little evidence supporting the validity of PPP. For a deutsche mark-based real exchange rate series, for the cases of both one and two breaks, there is evidence of stationarity of real exchange rates for eight sample countries, which is consistent with PPP. The results also indicate that the estimated half-life of a shock to the real exchange rate ranges from 1.25 (15.05 months) to 2.72 (32.72 months) years across countries. The empirical findings may provide direction for policy makers to coordinate monetary policies for the process of European monetary integration.     

International financial integration and national price levels: The role of the exchange rate regime

This paper proposes a new perspective on systematic deviations from purchasing power parity. Panel evidence for OECD countries shows that international financial integration increases the national price level under managed exchange rate regimes and lowers the price level under floating exchange rates. An open economy sticky-price model reproduces these findings by relating them to the possibility of insurance against consumption losses in internationally integrated financial markets. The utilization of insurance is reflected by relative price adjustments which manifest themselves in changes of the national price level. The direction of relative price adjustments, however, depends on the extent to which insurance is used under different exchange rate regimes: under a peg, financial integration raises the national price level; under a float, however, financial integration lowers the national price level.     

Openness,relative prices,and macro-policies

This paper analyzes the role of relative prices in the conduct of wage indexation, monetary policy, and exchange rate policy in a small economy producing traded and nontraded goods under a managed float exchange rate regime. It is shown that the beneficial effect of using relative prices in addition to aggregate prices as indicators for the conduct of the above policies increases with openness. The response of policies to relative prices rises with openness, and has dampening effects on the volatility of deviations from purchasing power parity.     

A fundamental theory of exchange rates and direct currency trades

In this paper we construct a two-country search model to determine the nominal exchange rate between two fiat monies. Our model allows agents to use any currency to trade for goods in all countries. However, search frictions restrict agents’ opportunities for instantaneous arbitrage, and hence make the nominal exchange rate determinate. The nominal exchange rate depends on the two countries’ economic fundamentals, including the stocks and growth rates of the two monies. Direct exchanges between currencies are essential and they imply a nominal exchange rate that is different from the relative price between the two currencies in the goods markets. There are persistent violations of the law of one price and purchasing power parity in equilibrium, despite the fact that prices are perfectly flexible and all goods are tradeable between countries. Nominal and real exchange rates can move together in the steady state in response to money growth shocks.     

Deviations from Purchasing Power Parity in the Long Run

This paper demonstrates that deviations from purchasing power parity reveal a remarkable and possibly startling consistency with martingale behavior during both fixed and flexible rate periods, for a wide variety of countries, and in both monthly and annual data. Since this pattern appears to be much more general than one would expect on the basis of models founded on international commodity arbitrage, the paper proposes an alternative explanation which instead relies on financial arbitrage in bonds as the underlying mechanism.     

International asset pricing under segmentation and PPP deviations

We analyze the impact of both purchasing power parity (PPP) deviations and market segmentation on asset pricing and investor's portfolio holdings. The freely traded securities command a world market risk premium and an inflation risk premium. The securities that can be held by only a subset of investors command two additional premiums: a conditional market risk premium and a segflation risk premium. Our model is empirically supported with important implications for tests of international asset pricing.