Real exchange rates and unit root tests

Real Exchange Rates and Unit Root Tests. — This paper examines monthly OECD exchange rate data (1979–1997) using univariate and panel data unit root tests. Some of these tests support the hypothesis of a unit root. But tests of cointegration reveal the existence of weak purchasing power parity relationships between bilateral nominal exchange rates and relative prices. We suggest that researchers need not conduct unit root tests on real exchange rate data when a modified version of PPP is used; or if there is a long enough time series. Given the definition of real exchange rates, the indicator should be stationary and should have intrinsic mean reverting behaviour.     

Stochastic behavior of nominal exchange rates

This article is concerned with the statistical modeling of the daily structure of the nominal exchange rates in the U.K., Germany, and Japan, as well as their returns in relation to the U.S. dollar by means of using fractionally integrated techniques. Using a version of the tests of Robinson [1994] that permits us to tests I(d) statistical models, the results show that the three time series are I(1), finding strong evidence against fractional integration and against mean reversion. Similarly for the return series, all them appear to be stationary I(0) with no evidence of fractional integration of any degree in any series.     

Central bank intervention and exchange rate dynamics: A rationale for the regime-switching process of exchange rates

By proposing a stochastic intervention model of exchange rate determination, this paper provides an alternative rationale for the success of the Markov-switching model in explaining exchange rate dynamics. One extreme case is a pure floating rate model while the other extreme one is a driftless random walk model. The relation between the exchange rate and the future fundamentals under a non-intervention state is looser than the one under a pure floating exchange regime. This article also provides a method for detecting a central bank's interventions when intervention data are not available. Applying the stochastic intervention model to the monthly NT$/US$ exchange rates in 1989M1–2004M6, we find that it outperforms both the pure floating rate model and the random walk model in terms of the likelihood value and the diagnostic test of heteroscedasticity. In addition, with the constructed intervention state index in this article, the estimation of the stochastic intervention model is found to be consistent with the hypothesis that the regime switches of exchange rates are due to a central bank's (non-)interventions. J. Japanese Int. Economies 21 (1) (2007) 64–77.     

The stock market and the ringgit exchange rate: a note

This paper presents and tests an augmented monetary model that includes the effect of stock prices on the bilateral exchange rates. The model is applied to the ringgit/US dollar (RM/US) and ringgit/Japanese yen (RM/JY) exchange rates. The empirical analysis is conducted by the Johansen method of cointegration. Using the data from the recent float that ends with 1996:Q4, the study is motivated, among others, by an interesting preliminary finding that although the augmented monetary model is cointegrated, it is subject to parameter instability and that the parameter time dependency can be attributed at least partly to a particular subset of the variables in the system including stock prices. We find that a restricted VAR model which imposes exogeneity restrictions on I(1) variables, such as stock prices, among others, exhibits both cointegration and parameter stability. In addition, we demonstrate that exchange rate adjusts to clear any disequilibrium in the long-run relationship. The empirical findings tend to suggest that the equity market is significant in affecting the exchange rate and in explaining at least in part the parameter instability evidenced in the cointegrating system. Hence, we conclude that models of equilibrium exchange rate should be extended to include equity markets in addition to bond markets.     

World-consistent equilibrium exchange rates

This paper proposes a systematic analysis of the problem of world consistency when deriving equilibrium exchange rates. World inconsistency can arise for two reasons. First, real effective misalignments of currencies out of the considered sample are implicitly assumed to be the mirror image of those of the currencies under review. Second, only N − 1 independent bilateral equilibrium exchange rates can be derived from a set of N effective rates. Here we measure the extent of these two problems by estimating equilibrium exchange rates for 15 countries of the G20 in effective as well as bilateral terms and by varying the assumptions concerning the rest of the world (RoW) and the numeraire currency. Our results show that the way the rest of the world is tackled has a major impact on the calculation of effective misalignments and especially bilateral misalignments.     

Systematic sampling and real exchange rates

Systematic Sampling and Real Exchange Rates. — Four major real bilateral exchange rates are shown to be well characterized by nonlinear stationary models over the recent float. Using Monte Carlo methods, this paper examines the effects of systematic sampling on the behaviour of real exchange rates and shows that: systematic sampling reduces significantly nonlinearity in real exchange rates and affects their lag structure; given a certain span, the frequency of the data set becomes crucial for detecting mean reversion in real exchange rates once the analysis is switched from a linear to a nonlinear model. Monte Carlo simulations also suggest that the parameter governing the speed of nonlinear mean reversion may be upward biased.     

The informational content of implied volatility: Application to the USD/JPY exchange rates

This paper tests the information content of the Japanese Yen Implied Volatility Index (JYVIX) regarding the future volatility of USD/JPY exchange rates. We find that JYVIX contains significant information about future volatility, and it even has incremental predictive power over the traditional GARCH-Type models. Implicitly, JYVIX as a looking-forward index provides better forecasts on conditional volatility rather than realized volatility. Our analysis further shows that the forecastability of the GARCH-Type model combined with JYVIX is more credible than these individual models. Specifically, the EGARCH model combined with the exogenous variable JYVIX outperforms all prediction models. Our findings provide a better prediction approach to the volatility of USD/JPY exchange rates, which has far-reaching significance for risk management in Asian economies.     

Effect of exchange rate risk on intra-EC trade

Summary The smooth development of the EMS towrds an exchange rate system with fixed exchange rates among its member countries recently came to an abrupt (temporary) end. This raises the question whether exchange rate volatility is damaging to international trade. So far, it has remained an open empirical question whether exchange rate variability has the presumed negative effects. This article shows that the exports of five countries participating in the ERM have substantially benefited from the diminische exchange rate risk in the period from 1979 up to and including 1990. Contrary to former empirical studies, which deal with figures for total trade or total trade or total manufactures, the analysis here has been conducted for exports broken down by type of product. The study suggests that a more disaggregated analysis, with respect to products or sectors, might be a fruitful way of identifying the effects of exchange rate volatility on international trade.     

An empirical analysis of China's equilibrium exchange rate: A co-integration approach

This paper estimates time specific values for China's long-run equilibrium exchange rate and develops measures of the direction and extent of misalignment based on a reduced-form real effective exchange rate (REER) model. An appropriately specified long-run equilibrium model is estimated and tested following Johansen and Juselius (1990) procedures, which is then used to construct an estimated time path for long-run equilibrium exchange rate values.Unit root tests indicated that each series can be considered as I(1) and that there was one cointegrating relationship linking the RMB series with its “fundamentals” – openness, money supply, productivity and government spending – with long-run elasticities of (0.41), (0.97), (0.51) and (0.75), respectively. The estimated error-correction model of REER determination showed that during China's latest exchange rate regime (from 2005:Q3) the RMB was undervalued by an average of 6.7 percent, which is modest compared to related studies.Estimation of the associated short-run error correction model shows that the error correction term has a statistically significant value of 0.85, implying that the actual real effective exchange rates would converge relatively quickly (just over one quarter, on average) towards their long-run equilibrium level in the absence of central bank intervention.     

Monetary policy shocks and exchange rates in Asian countries

In this paper, we empirically investigate the effects of monetary policy shocks on exchange rates in Asian countries. To do so, we use VAR models which impose sign restrictions on impulse responses to identify monetary policy shocks. We find that contractionary monetary policy shocks lead to significant exchange rate appreciation in Malaysia, the People’s Republic of China, and the Republic of Korea. However, in India, Indonesia, the Philippines and Thailand, we find either a significant depreciation or no significant effect. These results suggest that an interest rate increase (or decrease) may not necessarily shield Asian countries from exchange rate depreciation (or appreciation) pressure following a U.S. interest rate increase (or decrease).     

Real exchange rate determination in eastern Europe

This paper develops a simple theoretical model of exchange rate determination in a transitional economy. The distinguishing feature of the model is the retention of market failures pertaining to the production and consumption of nontradable goods and, therefore, the likelihood of real exchange rate appreciation. Using this framework, the econometric tests are performed for the Czech Republic, Slovenia, Poland, and Hungary, and appropriate macroeconomic and exchange rate policies are recommended to support further liberalization and development of the foreign exchange market.     

Post-crisis monetary and exchange rate policies in Indonesia,Malaysia and Thailands

This paper surveys the post-crisis monetary and exchange rate policies of Indonesia, Thailand and Malaysia. Malaysia has pegged the ringgit while Indonesia and Thailand have adopted heavily managed exchange rates. Under their IMF programs, Thailand and Indonesia set base money targets, but Thailand has moved, and Indonesia is now moving, to inflation targeting, using interest rates as the short-term instrument. Malaysia also sets interest rates. The ability of the three central banks to set interest rates and also pursue an exchange rate target with an interest rate target has been bolstered by restrictions on the internationalisation of the domestic currency. The three central banks have also had to sterilise the monetary effects of their foreign exchange interventions. It is argued that inflation targeting is now a good policy choice, but that a more freely floating exchange rate would be better than sterilisation of balance of payments surpluses or deficits.     

Cambium non est mutuum: exchange and interest rates in medieval Europe

A major gap in our understanding of the medieval economy concerns interest rates, especially relating to commercial credit. Although direct evidence about interest rates is scattered and anecdotal, there is much more surviving information about exchange rates. Since both contemporaries and historians have suggested that exchange and rechange transactions could be used to disguise the charging of interest in order to circumvent the usury prohibition, it should be possible to back out implied interest rates from exchange rates. The analysis presented in this article is based on a new dataset of medieval exchange rates collected from commercial correspondence in the archive of Francesco di Marco Datini of Prato, c. 1383–1411. It demonstrates that the time value of money was consistently incorporated into market exchange rates. Moreover, these implicit interest rates are broadly comparable to those received from other types of commercial loan and investment. Although on average profitable, the return on any individual exchange and rechange transaction did involve a degree of uncertainty that may have justified their non‐usurious nature. However, there were also practical reasons why medieval merchants may have used foreign exchange transactions as a means of extending credit.     

The Balassa–Samuelson model of purchasing power parity and Chinese exchange rates

Our principal purpose here is to assess the extent to which both the official and black market exchange rates for the Chinese economy exhibit compatibility with the Balassa–Samuelson model over the period from 1985 to 2006. We employ annual measures of inflation and industry input on an aggregated, disaggregated and sector basis, all of which have been especially constructed for this study. Both the time series and panel cointegration tests applied to this data are generally inconsistent with the prediction of the Balassa–Samuelson model that the tradable goods sector is compatible with purchasing power parity. However, our analysis also shows that other predictions of the Balassa–Samuelson model – most notably that there will be a strong long-run relationship between the real exchange rate and the relative productivity differential between China and the U.S. – does hold up for the Chinese economy. Moreover, the black market exchange rate appears to be more consistent with the predictions of the Balassa–Samuelson model than the official exchange rate.     

Capital flows and real exchange rates in emerging Asian countries

This paper examines the impact of capital flows on real exchange rates in emerging Asian countries during 2000–2009 using a dynamic panel-data model. The estimation results show that the composition of capital flow matters in determining the impact of the flows on real exchange rates. Other forms of capital flow, especially portfolio investment, bring in a faster speed of real exchange rate appreciation than foreign direct investment (FDI). However, the magnitude of appreciation among capital flows is close to each other. The increasing importance of merger and acquisition (M&A) activities in FDI in the region makes these flows behave closer to other forms of capital flow. The estimation results also show that during the estimation period, capital outflows bring about a greater degree of exchange rate adjustment than capital inflows. This evidence is found for all types of capital flow. All in all, the results indicate that the swift rebound of capital inflows into the region could result in excessive appreciation of (real) currencies, especially when capital inflows are in the form of portfolio investment.     

人民币汇率制度改革以及汇率波动性研究

自我国1978年改革开放以来,我国汇率制度的改革大体上经过了3个阶段:复汇率制度、单一有管理浮动汇率制度、参考"一篮子货币"有管理浮动汇率制度。本文着重讲述了这三个阶段汇率制度的改革情况,分析了人民币兑美元的汇率走势,并对汇率波动性进行实证研究,然后指出我国汇率制度当前存在的问题,以及针对这些问题提出改革的下一步路径。     

Fiscal announcements and real exchange rate dynamics

This paper examines the dynamic impact of anticipated government spending on real exchange rates in a general-equilibrium framework. I show that an increase in government spending causes persistent movements in real exchange rates, and that the time profile of real exchange rates differs with patterns of government spending. Hence, one of the explanations for the misalignment and excess volatility of real exchange rates during the flexible exchange rate system may be volatile changes in government spending.     

Structural breaks and the equilibrium real effective exchange rate of China: A NATREX approach

This paper investigates the equilibrium real effective exchange rate for the Chinese RMB during the post-reform period, 1982–2010. We extend the NATREX model in several important perspectives and apply it for the first time to China. A wide range of economic fundamentals that are unique to the Chinese economy is introduced into the model. We construct a unique set of quarterly data and employ unit root and cointegration tests that can account for multiple endogenous structural breaks. In addition, to capture the evolution of China's foreign trade pattern, we employ time-varying (i.e. 3-year average) trade weights to construct the real effective exchange rate. We find two structural breaks in the cointegration relationship (in 1988 and 1992). Effective terms of trade, demographic factors, liquidity constraints and government investment are significant determinants of the equilibrium real effective exchange rate. The RMB was overvalued against a basket of 14 currencies until mid-1980s. During 1986–2010, it was undervalued in most years except after the Asian financial crisis in 1997. We have found persistent undervaluation from 2004 onwards. However, the misalignment rates are much lower than those reported by previous studies and the undervaluation rate actually declined sharply in 2008. The undervaluation rate rose modestly in 2009 and sharply in 2010, though it is still lower than what has been suggested by other studies.     

Interest rates, exchange rates and international adjustment: BW II dynamics

Recent attempts to explain the dynamics of adjustment of dollar exchange rates in the face of an anticipated deterioration of the US net international investment position have focused on portfolio balance models of exchange rate determination. In this paper we argue that such models are useful in understanding the behavior of dollar exchange rates with emerging market currencies but, consistent with a large body of empirical research, are not useful in understanding changes in the dollars value against the euro or the currencies of other developed countries. We conclude that portfolio preferences of governments of emerging markets provide the most plausible explanation for the persistent US current account deficit.     

Testing for cointegration with threshold effect between stock prices and exchange rates in Japan and Taiwan

This paper empirically investigates the exchange rate effects of the New Taiwan dollar against the Japanese Yen (NTD/JPY) on stock prices in Japan and Taiwan from January 1991 to Mach 2008. Our study employs the newly threshold error-correction model (TECM) elaborated by Enders and Granger [Enders, W., Granger, C.W.F., 1998. Unit-root tests and asymmetric adjustment with an example using the term structure of interest rates. Journal of Business Economics & Statistics 16, 304–311] and Enders and Siklos [Enders, W., Siklos, P.L., 2001. Cointegration and threshold adjustment. Journal of Business Economics & Statistics 19, 166–176], assuming the nature of the relationship between the variables is on the basis of non-linearity. The empirical evidence suggests that there is a long-run equilibrium relationship between NTD/JPY and the stock prices of Japan and Taiwan during the time period investigated. However, an asymmetric threshold cointegration relationship only exists in Taiwan’s financial market. Furthermore, we extend our research by taking into account the effect of the U.S. exchange rate specifically on Taiwan’s financial market. This research also finds a long-term equilibrium and asymmetric causal relationships between NTD/USD and the stock prices of Taiwan. In addition, the results of TECM Granger-Causality tests show that no short-run causal relationship exists between the two financial assets considered for both countries’ cases. However, in the long run a positive causal relationship running from either the Japan or U.S. exchange rate to the stock prices of Taiwan strongly argues for the traditional approach.