Long‐Run PPP under the Presence of Near‐to‐Unit Roots: The Case of the British Pound–US Dollar Rate*

Empirical tests typically provide evidence that the British pound–US dollar exchange rate and the relative wholesale price index contain exact unit roots and exhibit cointegration. However, the cointegrating vector is significantly different from [1, ?1], thus raising doubts on the validity of the purchasing power parity (PPP) hypothesis. Following Elliott (1998 ), we show that if the exchange rate and relative price series contain near‐to‐unit roots in the context of a bivariate system, then any inference on the “cointegrating” vector and consequently on PPP, which is based on standard cointegration estimation methods, will be misleading. We then argue that the existing evidence against the PPP hypothesis in the British pound–US dollar market can be attributed to the finite sample bias of the standard cointegration estimators, arising from an endogenous and “nearly” nonstationary regressor. We also show that when robust procedures are employed the evidence favors the PPP hypothesis.     

The persistence in real exchange rate: Evidence from East Asian countries

In this article, we examine the degree of persistence in monthly real exchange rate of six East Asian countries in relation to their two major trading partners, the United States and Japan, to study the validity of PPP for the 1976:01–2009:03 period. To investigate the persistency in real exchange rate series, we use sum of the autoregressive (AR) coefficients and the confidence interval for it using grid-bootstrap procedure recently developed by Hansen (1999). We have two findings: first, we find evidence for high persistency in real exchange rate in terms of the Japanese yen for five countries and for four countries in terms of the US dollar the for the full and pre-crisis sample periods. Second, for the post-crisis period, the presence of low persistency in real exchange rate supports PPP for three countries in terms of the Japanese yen and five countries in terms of the US dollar. These findings indicate that real exchange rate series of five East Asian countries are mean-revert based on their exchange rate policies and East Asian countries can form a currency union.     

Further evidence on purchasing power parity and country characteristics

Using data from 76 countries, this paper investigates the relationship between country characteristics and the validity of purchasing power parity (PPP). Several interesting results are obtained based on dollar-based exchange rates. First, PPP holds for Africa and Latin America. Further, PPP tends to be supported for countries with high or moderate openness, low growth rates, high inflation rates and high nominal exchange rate volatility, respectively. Second, a single country characteristic seems inadequate to account for the validity of PPP. Third, PPP is supported if countries satisfy at least two characteristics of supporting PPP simultaneously. Finally, the main results of the paper are robust when the numeraire currency changes from the US dollar to Japanese yen.     

Portfolio flows and the US dollar–yen exchange rate

This paper investigates the effects of portfolio flows on the US dollar–Japanese yen exchange rate changes over the period 1988:01–2011:04. Using a time-varying transition probability Markov-switching framework, the results suggest that the impact of portfolio flows on the dollar–yen exchange rate changes is state-dependent. In particular, the results show that portfolio inflows from Japan toward the US, more than monetary variables, strengthen the probability of remaining in the dollar–yen appreciation (low volatility) state. Therefore, credit controls on the flows can be used as a policy tool to pursue economic and financial stability.     

Explaining the early years of the euro exchange rate: An episode of learning about a new central bank

Many observers were surprised by the depreciation of the euro after its launch in 1999. Handicapped by a short sample, explanations tended to appeal to anecdotes and lessons learned from the experiences of other currencies. Now sample sizes are just becoming large enough to permit reasonable empirical analyses. The model of this paper provides empirical support for the euro exchange rate to be affected by learning. By focusing on euro-area inflation as the key fundamental, the model is structured toward the dynamics of learning about ECB policy with regard to inflation. While a stated target inflation rate of 2 percent existed, it may be that market participants had to be convinced that the ECB would, indeed, generate low and stable inflation. With a prior distribution drawn from the pre-euro EMS experience and updating based upon the realized experience each month following the introduction of the euro, the evidence suggests that it was not until December of 1999 that the market assessed a greater than 50 percent probability that the inflation process had changed to a new regime. From this point on, trend depreciation of the euro ends and further increases in the probability of the new inflation process are associated with euro appreciation versus the US dollar, the British pound and the Japanese yen.     

Asymmetric Exchange Rates and Unofficial Exchange Rate Interventions: The Case of South Korea

Applying Milton Friedman's ‘plucking’ model of output fluctuations, we investigate the behavior of the Korean won/dollar exchange rate using a state-space model with Markov switching, which incorporates both symmetric and asymmetric shocks. We find that the Korean won/US dollar exchange rate rarely falls below its trend, but is plucked upward from time to time by transitory shocks. This asymmetry suggests that the monetary authority unofficially intervenes in the foreign exchange market to support its own target level from below. Further evidence from changes in reserve assets indirectly supports our finding.     

Purchasing power parity and country characteristics: Evidence from panel data tests

We examine long-run purchasing power parity (PPP) using panel data methods to test for unit roots in US dollar real exchange rates of 84 countries. We find stronger evidence of PPP in countries more open to trade, closer to the United States, with lower inflation and moderate nominal exchange rate volatility, and with similar economic growth rates as the United States. We also show that PPP holds for panels of European and Latin American countries, but not for African and Asian countries. Our findings demonstrate that country characteristics can help explain both adherence to and deviations from long-run PPP.     

Priced on the note: the case of Japanese IPOs

ABSTRACT

This article examines the pricing of Japanese IPOs: 54.26% are priced in 1,000 Japanese yen increments (The Japanese yen (JPY) has denominations of banknotes and coins. Banknotes are in 1,000, 2,000, 5,000, and 10,000-yen. Coins are in 1, 5, 10, 50, 100, and 500-yen. One thousand banknotes are similar to US $10 dollars. Coins are considered as changes in Japan.) (note-ending IPOs), an economically large increment on a per-share basis that is equivalent to 10 US dollar increments assuming an exchange rate of 1 US dollar to 100 Japanese yen. The number of note-ending IPOs increases with price levels and pricing uncertainty, supporting the negotiation hypothesis. Note-ending IPOs are associated with higher volatility, higher underwriters’ fees, wider filing price range, smaller deal size, shorter firm age, and lower underwriter reputation. Price clustering contributes to IPO underpricing. The initial returns are 60.44% higher for note-ending relative to coin-ending IPOs. These results shed light on the pricing of Japanese IPOs due to negotiations and on investment opportunities with note-ending IPOs.     

Do foreign exchange forecasters apply asymmetric loss functions? Evidence from three major exchange rates

This article investigates which type of loss function is consistent with the hypothesis that major exchange rate forecasts, i.e. the euro, the British pound, and the Japanese yen vis-à-vis the US dollar, are rational. We apply a comprehensive data set, which also allows us to examine different forecast horizons and heterogeneity of forecasters.     

Reexamining the PPP hypothesis: A nonlinear asymmetric heterogeneous panel unit root test

In this study, we re-examine the PPP hypothesis in the light of the new developments in the unit root testing literature. The recent theoretical findings have pointed out that the real exchange rate series exhibit asymmetric nonlinear behavior. A unit root test applied to analyze the PPP hypothesis therefore, should also take into account this asymmetry inherent in the real exchange rate. Different unit root tests that consider the presence of these data features have been developed in the time series literature. However, a true attempt to test the PPP hypothesis should take a panel data approach. To this end, we propose a nonlinear heterogeneous panel unit root test where the alternative hypothesis allows for symmetric or asymmetric exponential smooth transition autoregressive nonlinearity and provide its finite sample properties. We apply our test to the real exchange rates of the 15 European Union countries against the US dollar. While the results of the linear and symmetric nonlinear heterogeneous panel unit root tests are against the PPP hypothesis, the asymmetric nonlinear heterogeneous panel test that we propose gives support for the PPP hypothesis as expected. Therefore, the conclusions drawn from the linear panel unit root tests or the nonlinear panel unit root tests that do not take asymmetry into account might be misleading.     

Sources of Exchange Rate Movements in Japan: Is the Exchange Rate a Shock‐Absorber or a Source of Shock?

This paper investigates the sources of movements of the yen–dollar exchange rate using a structural vector autoregression (VAR) with a combination of short‐run and long‐run zero restrictions. We find that real shocks dominate nominal shocks in explaining the exchange rate movements, with relative real demand shocks as the major contributor. The exchange rate market does not seem to be a major source of disturbances to the Japanese economy. The overall results support the view that the bilateral dollar exchange rate in Japan is a shock‐absorber rather than a source of shocks.     

The PPP hypothesis and structural breaks: the case of Mexico

We test the purchasing power parity hypothesis for the Mexican peso/US dollar real exchange rate using monthly data for 1969–2010. Results suggest that the real exchange rate reverts to a changing mean. These mean shifts can be explained by liberalization policies implemented during the 1980s and 1990s that reduced trade barriers in the Mexican economy. Such policies modified the tradable/non-tradable goods composition of the price index producing mean shifts in the real exchange rate associated with PPP.     

The purchasing power parity of Southeast Asian currencies: A time-varying coefficient approach

The economies of Southeast Asia have undergone several structural changes, including the Asian currency crisis, during the post-Bretton Woods era. We use a time-varying coefficient cointegration model to test for purchasing power parity (PPP) of Southeast Asian currencies and to track changes in purchasing power relationships over time. The main empirical findings are as follows. First, the stability of the relationship between exchange rates and price differentials is strongly rejected. Second, a major structural change occurs at the outbreak of the Asian currency crisis in 1997. Third, when the cointegration vector is allowed to vary with time, we find evidence of a cointegration relationship for four countries in terms of the US dollar and for four countries in terms of the Japanese yen. Therefore, it seems unlikely that Southeast Asian currencies form a “yen bloc.”     

A testing of the purchasing power parity hypothesis using a vector autoregressive model

The paper examines the hypothesis of purchasing power parity relations and the hypothesis of interest rates parity relations between the Japanese yen and the US dollar in a four-dimensional VAR (4-VAR) model, using the statistical technique developed by Johansen and Juselius (1992). The paper demonstrates that the so-called symmetry restriction on the PPP relationship holds not in a 3-VAR model but in the 4-VAR model, which indicates that a correct specification of the sampling distribution of data is important. The interest rates parity relation also holds in the 4-VAR model. The one-step prediction based on the ECM representation with such long-run relations outperforms the random walk model. These results are similar to those under the exchange rate control period (January 1974 to December 1980), which support the inclusion of this period in a whole sample period (January 1974 to December 2001).The author is very grateful to the referees and the editor of the journal for their variable and helpful comments. The first draft of the paper was presented at the autumn meeting of Japan Society of Monetary Economics in Oct 1999. The author is thankful to Eiji Ogawa for his helpful comments. The research was supported by Grant-in-Aid 13630104 of the Ministry of Education, Science and Culture of Japan and the Nomura Foundation for Social Science in 2000.First version received: March 2001/Final version received: April 2003     

Do China and oil exporters influence major currency configurations?

This paper analyses the impact of the shift away from a US dollar focus of systemically important emerging market economies (EMEs) on configurations between the US dollar, the euro and the yen. Given the difficulty that fixed or managed US dollar exchange rate regimes remain pervasive and reserve compositions mostly kept secret, the identification strategy of the paper is to analyse the market impact on major currency pairs of official statements made by EME policy-makers about their exchange rate regime and reserve composition. Developing a novel database for 18 EMEs, we find that such statements not only have a statistically but also an economically significant impact on the euro, and to a lesser extent the yen against the US dollar. The findings suggest that communication hinting at a weakening of EMEs’ US dollar focus contributed substantially to the appreciation of the euro against the US dollar in recent years. Interestingly, EME policy-makers appear to have become more cautious in their communication more recently. Overall, the results underscore the growing systemic importance of EMEs for global exchange rate configurations.     

Volatility and Spillover Effects of Yen Interventions

We consider the effects of interventions by the Bank of Japan's (BoJ) on the intraday volatility of the US dollar/Japanese yen (USD/JPY) exchange rates and their spillovers to volatility of the euro/JPY exchange rates. We use 15‐minute data during the period 2000–2004 and employ multivariate generalized autoregressive conditional heteroskedasticity (GARCH) modeling and quartile plots of intraday volatility to analyze the intraday effects of the BoJ interventions on exchange rate volatility. The results indicate that the BoJ interventions decrease daily volatility of the USD/JPY exchange rate but increase the volatility of the euro/JPY series. On intervention days, the intraday volatility has different patterns to those on non‐intervention days.     

An empirical examination of long-run purchasing power parity as theory of international commodity arbitrage

An empirical analysis of long-run purchasing power parity (PPP) as a theory of international commodity arbitrage between UK and US prices and the sterling/US dollar exchange rate for the period 1975–1980 is presented. Econometric techniques concerning the cointegration of economic time series are applied to a sample of 35 manufactured commodities which in 1977 constituted approximately a quarter of the net output of all manufacturing industry in Great Britain. Our results are extremely unfavourable to the PPP hypothesis as a stable long-run proportionality between exchange rates and disaggregated prices.     

Smooth structural breaks and the stationarity of the yen real exchange rates

This article examines and solves an interesting paradox in the literature that the tests for purchasing power parity (PPP) based on the yen real exchange rates (RERs) refute the PPP hypothesis more often than those with other major currency-based RERs, and the evidence is sensitive to the sample period used. Using a new empirical methodology accounting for both nonlinearity and multiple smooth temporary breaks in the data, we show that the puzzling finding is due to the failure to take into account the long but temporary large rise and fall in the yen RERs. The results illustrate that the yen RERs in the post-Bretton Woods period are likely mean reverting with linear or nonlinear adjustment toward large, long swing type of infrequent smooth temporary changes around constant equilibrium values, supporting the validity of PPP and resolving the paradox.     

Testing for random walk in euro exchange rates using the subsampling approach

This study utilizes variance ratio tests based on the subsampling approach to test the behaviour of euro-based exchange rates markets. Results are mixed, although the random walk behaviour is dominant among the three major currencies namely the Japanese yen, the US dollar and the British pound.     

Risk premia in forward foreign exchange rates: a comparison of signal extraction and regression methods

We investigate possible presence of time-varying risk premia in forward pound, yen, and Euro monthly exchange rates versus the US dollar over the last two decades. We study this issue using regression techniques and separately using a signal plus noise model. Our models account for time-varying volatility and non-normality in the observed series. Our regression model rejects the hypothesis that the forward rate is an unbiased predictor of future spot exchange rate, indicating the existence of time-varying risk premium under rational expectations. Our signal plus noise model reveals a time-varying risk premium component in yen and Euro. The same model provides evidence for the presence of risk premium in pound over a shorter sample period, though not over the entire sample. We conclude that risk premia exist, although we may fail to detect these for some currencies over specific time periods.