利率平价关系不稳定条件下短期资本流动机制的运行

现代利率平价理论分无偏差预测理论与有偏差预测理论,两者对非抵补利率平价是否成立的观点截然相反。大量实证研究更多地表明在当今各种经济基本面、政策面及其不确定性预期等因素的影响下,利率平价关系日益呈现出不稳定性,在短期资本套利和套汇机制作用下,当期和未来短期资本流动方向均有不同变化。近几年来,我国短期资本流动发生较大波动,当前存在着短期资本重新转为大量流入的动向,政府需加强短期资本流动监控,以防遭受冲击。     

Uncovered Interest Parity: Cross‐Sectional Evidence

Uncovered interest parity (UIP) is estimated for short‐term horizons from one month to 12 months using a large number of cross‐sectional bilateral exchange rates. In contrast to conventional time‐series UIP, cross‐sectional UIP is examined with a single‐equation estimation and panel regression model estimation. The exchange rates analyzed here include a broad spectrum of countries: developed, developing, low‐inflation, and high‐inflation countries. Based on the empirical evidence, there does not appear to be a well‐publicized UIP puzzle for cross‐sectional UIP, and the slope estimates remain largely between zero and one throughout the sample periods, with a few exceptions. Evidence of UIP is more clear for low inflation countries than for high inflation countries. As interest rate maturity becomes longer from one month to 12 months, the UIP relationship becomes weaker.     

Uncovered interest parity and risk premium convergence in Central and Eastern European countries

This study applies non-linear threshold unit-root test to investigate the non-stationary properties of the uncovered interest parity (UIP) with risk premium for ten Central and Eastern European (CEE) countries. We find that non-linear threshold unit-root test has higher power than linear method suggested by Caner and Hansen (2001) if the true data generating process of risk premium convergence is in fact a stationary non-liner process. We examine the validity of UIP from the non-linear point of view and provide robust evidence clearly indicating that UIP holds true for seven countries. Our findings point out that capital mobility and exchange market efficiency are in these CEE countries with non-linear way.     

Monetary Policy Regime Shifts and Uncovered Interest Parity Revisited: The Euro–US Dollar Exchange Rate

ABSTRACT

To explore possible sources of the well-documented uncovered interest parity (UIP) violation in the foreign exchange market, this paper scrutinizes structural changes in monetary reactions to inflationary pressure in the conventional approaches to nominal exchange rate and examines how this small but important change has an effect on the empirical implications of the UIP condition. In addition to some salient features found in the euro exchange rate, by introducing occasional monetary policy regime shifts into an otherwise standard open-economy dynamic general equilibrium model, we found some important findings that potentially help better understand exchange rate dynamics. During the entire sample period, 1999:M1–2014:M8, exchange rate disconnect puzzle still exists. However, sub-sample analysis suggests that relatively passive monetary reaction implying less frequent intervention by monetary authority tends to be more consistent with the UIP relation. Simulation results support the empirical regularities.     

Inflation and output dynamics with a floating exchange rate

The purpose of this paper is to extend a simple monetarist model of price output fluctuations in a closed economy to the case of a small open economy with a floating exchange rate. Trade and capital flows are explicitly incorporated into the model, exchange rate expectations and inflation expectations are treated separately and exchange rate expectations are integrated into the demand for money function. The properties of the model are investigated under the limiting cases of perfect capital mobility and zero capital mobility. Stability conditions and short run price-output trade-offs are derived and the conclusions for cyclical output patterns are deduced. It is also shown how the short run movement of the exchange rate deviates from purchasing power parity in a systematic fashion.     

The validity of uncovered interest parity: Evidence from african members and non-member of the organisation of petroleum exporting countries (OPEC)

This paper re-examines uncovered interest parity (UIP) puzzle using Africa where there is dearth of studies. It extends the previous literature in the following ways. It captures the heterogeneity (oil and non-oil sources of shocks) in the region by considering both African members of the Organisation of Petroleum Exporting Countries- OPEC (Algeria, Nigeria and Angola) and non-member (South Africa) to ensure generalisation of findings. It also explores asymmetric exchange rate responses to diverse monetary policy stances from a new dimension by explicitly measuring asymmetries and capturing long- and short-run dynamics using the new non-linear autoregressive distributed lag (NARDL) and asymmetric component AC-GARCH models along with other recent methods for results' robustness. Results from alternative methods show that UIP fails to hold in the African members and non-member of OPEC which is attributable to capital mobility restrictions and currency risk. However, asymmetric and permanent/transitory exchange rate response to monetary policy stances was noticed with little evidence of risk premium dynamics and role of price level instability in UIP validity.     

The existence of uncovered interest parity in the CIS countries

This paper examines uncovered interest parity (UIP) for six countries of the Commonwealth of Independent States (CIS) – Armenia, Azerbaijan, Georgia, Kazakhstan, Kyrgyzstan and Moldova – using quarterly data on spot exchange and three-month Treasury bill interest rates over the period 1995:01–2010:02. Three model specifications are used: the conventional ‘approximate’ interest differential model specified in first differences of exchange rates and the two unconventional ‘precise’ models specified in levels of exchange rates. Results obtained from the former model are consistent with UIP, since the coefficient on the interest differential is positive in all cases. These results imply that the CIS currencies offering a significant interest differential tend, on average, to depreciate over the sample period as UIP predicts. Results from the latter two models are strongly supportive of UIP in the long run in all cases, except for Armenia when a restricted specification is used, and Armenia, Moldova and Georgia when an unrestricted specification is used. Yet the deviations from UIP that are allowed in the short run may lead to the profitability of carry trade in the CIS currencies offering the significant interest differentials. The results confirm that carry trade is highly lucrative in all the CIS currencies, and outperforms the U.S. stock market.     

Exchange Rates and Long‐Term Bonds*

There is tentative evidence to suggest that the well‐documented empirical failure of uncovered interest parity (UIP) is confined to short‐term interest rates. However, tests of UIP for long‐term bonds are thwarted by various data problems. These data problems can be avoided by focusing on short investments in long‐term bonds. This paper concerns the relationship between changes in the US dollar–Deutsche Mark exchange rate and returns to short investments in US and German long‐term government bonds. The hypothesis that expected returns to investments in bonds denominated in the two currencies are equal is not rejected, and the estimated slope coefficients are positive. For corresponding short‐term interest rates, the typical finding of negative and large Fama coefficients is confirmed. We conclude that it is the maturity of the asset, rather than the investment horizon, that matters for the results.     

Non-stationary Interest Rate Differentials and the Role of Monetary Policy

Abstract

The present work deals with a frequently detected failure of the uncovered interest rate parity (UIP) – the absence of bivariate cointegration between domestic and foreign interest rates. We explain the non-stationarity of the interest differential via central bank reactions to exchange rate variations. Thereby, the exchange rate in levels introduces an additional stochastic trend into the system. Trivariate cointegration between the interest rates and the exchange rate accounts for the missing stationarity property of the interest differential. We apply the concept to the case of Turkey and Europe, where we can validate the theoretical considerations by multivariate time series techniques.     

On the Transmission Mechanism of Monetary Constraints to the Real Side of the Economy

Contrary to the predictions of the theory underlying international finance, inflows of capital triggered by financial liberalisation have neither equalised real interest rates nor increased income growth in many emerging economies. We explain this puzzle by developing a model that combines the balance‐of‐payments constraint approach to economic growth with a less stringent version of the real interest rate parity hypothesis. The model’s foundations are based on robust empirical findings or well‐established macroeconomic models. We show that a perverse combination of income elasticities of demand for imports and exports generates slow income growth and high real interest rates. As domestic income grows and imports rise faster than exports, the real exchange rate is expected to depreciate in order to clear the balance of payments (or the foreign exchange rate market). An incipient capital outflow arises and interest rates increase. Faster adjustment in capital rather than in the goods market therefore generates a higher real interest rate differential between the domestic small open‐economy and the rest of the world. The long run analysis shows that a constant degree of risk aversion implies a positive equilibrium real interest rate differential that affects economic growth. A permanent increase in default risk driven by persistent current account imbalances thus impacts on long run growth. The model’s results are illustrated with evidence from the three major Latin America economies: Argentina, Brazil and Mexico.     

Exchange Rate Determination: An Application of a Monetary Model for Brazil

The goal of this paper is to test a variant of the monetary exchange rate determination model, described by Obstfeld and Rogoff (1996), for the Brazilian economy in the recent period. The model starts with the Cagan (The Journal of Political Economy, 66(4):303–328, 1958) money demand, which is complemented by the hypotheses of purchase power parity (PPP) and uncovered interest parity (UIP). We used monthly data of exchange rate, GDP, interest rate for Brazil, and U.S. interest rate and inflation as proxies for international variables. We applied cointegration tests to identify a long run relationship among the variables. The estimated error correction model offers an exchange rate determination model in the short run. Due to potential endogeneity of some variables, GMM was applied to estimate a long-run model of exchange rate determination. The forecasting results of both estimatives were compared with a random walk approach. The results point to the existence of a long and short run equilibrium Real/dollar exchange rate using the structural model, which may be the achievement of this paper.     

TESTING UNCOVERED INTEREST PARITY: A CONTINUOUS‐TIME APPROACH*

Nowadays researchers can choose the sampling frequency of exchange rates and interest rates. If the degree of overlap is large relative to the sample size, standard GMM asymptotic theory provides unreliable inferences in uncovered interest parity (UIP) regression tests. We specify a continuous‐time model for exchange rates and forward premia robust to temporal aggregation, unlike existing discrete‐time models. We test the UIP restrictions on the continuous‐time model parameters and propose a novel specification test that compares estimators at different frequencies. Our results based on correctly specified models provide little support for UIP at both short and long horizons.     

Uncovered interest parity puzzle: does it really exist?

Most studies indicate the violation of the Uncovered Interest Parity (UIP) restrictions, and indeed, there are many who find a statistically significant and negative interest rate differential slope. This finding has now become known in international economics as the UIP puzzle. Using recent data on four major currencies vis-à-vis the US dollar and employing the Generalized Method of Moments (GMM) technique, our estimation results indicate the absence of any relationship between the interest rate differential and the expected change in the exchange rate, rather than the presence of the UIP puzzle.     

The Optimal Degree of Exchange Rate Flexibility: a Target Zone Approach*

This paper presents a benchmark model that rationalizes the choice of the degree of exchange rate flexibility. We show that the monetary authority may gain efficiency by reducing volatility of both the exchange rate and the interest rate at the same time. Furthermore, the model is consistent with some known stylized facts in the empirical literature on target zones that previous models were not able to generate jointly—namely, the positive relation between the exchange rate and the interest rate differential, the degree of nonlinearity of the function linking the exchange rate to fundamentals, and the shape of the exchange rate stochastic distribution.     

Uncovered Interest Parity at Long Horizons: Evidence on Emerging Economies*

This paper estimates uncovered interest parity (UIP) at long horizons using bilateral US dollar rates vis‐à‐vis mature economy and emerging market currencies. The paper finds support in favor of UIP for dollar rates vis‐à‐vis major mature economy currencies, but far less against emerging market currencies. There are also signs that political risk and the exchange risk premium help explain the empirical failure of UIP for these latter currencies. This suggests that whether UIP holds depends more on the currency than on the horizon.     

Uncovered interest parity in Central and Eastern Europe: Expectations and structural breaks

This paper examines the empirical validity of the hypothesis of uncovered interest parity (UIP) using data from five Central and Eastern European countries with floating exchange rates for the period 2003 to 2014. The analysis includes forward‐looking as well as static expectations and allows for different types of structural break. The variable depicting the deviation from strict UIP is stationary when expectations are forward looking, suggesting that it is not possible to reject the UIP hypothesis with a constant risk premium. The deviation from strict UIP is however typically not stationary when expectations are static, even when structural breaks are incorporated, leading to the rejection of the UIP hypothesis with a constant risk premium. The results underscore the central role of expectations for the UIP hypothesis.     

The puzzling dual of the uncovered interest parity puzzle evidence from Pacific Rim capital flows

International financial arbitrage should prevent the existence of non-zero expected returns when borrowing in one currency and lending in another implying that interest differentials should predict exchange rate movements. The failure of interest differentials to act as an unbiased predictor of future exchange rate movements is referred to as the uncovered interest parity puzzle. This paper explores whether capital flows respond to these interest differentials in the context of a model in which dynamic adjustment costs keep capital from flowing immediately across borders. The paper finds little or even a negative relationship between expected excess returns on exchange rate adjusted U.S. money market rates (relative to domestic interest rates) and capital flows to the U.S. from Australia, Canada, Japan or Korea.     

Exchange Rate Dynamics in a Multilateral Target Zone

This paper presents a model of exchange rate behaviour in a multilateral target zone. The model produces new economic insights beyond the well-known bilateral model of Krugman (1991), which is obtained as a special case. The paper also introduces a new class of stochastic processes in economics, namely multidimensional reflected diffusion processes.
Two main features characterize the economics of exchange rates in a multilateral target zone. (i) The restrictions on interventions imposed by cross-currency constraints: when one country changes its money supply, say because its exchange rate with a second country has hit its band, all exchange rates involving the currency of that particular country will be affected, regardless of their position within their respective bands. (ii) Cooperation in sharing the intervention burden: in general, the exchange rate between any two countries will depend on the fundamentals of third countries in a multilateral target zone. This is because if the monetary authorities intervene together, a shock in the fundamentals of any country will induce a revision of the expectation of future interventions of other countries.
The model reverts the counterfactual predictions of the bilateral model that the exchange rate steady-state density should be U-shaped and that its volatility should be a decreasing function of the distance of the exchange rate to the limits of its band. Thus, accounting for the multilateral feature of real-world target zones allows us to reconcile target zone models with the most salient empirical features of exchange rate behaviour.     

Money demand instability and real exchange rate persistence in the monetary model of USD–JPY exchange rate

This paper proposes a hybrid monetary model of the dollar–yen exchange rate that takes into account factors affecting the conventional monetary model's building blocks. In particular, the hybrid monetary model is based on the incorporation of real stock prices to enhance money demand stability and also, productivity differential, relative government spending, and real oil price to explain real exchange rate persistence. By using quarterly data over a period of high international capital mobility and volatility (1980:01–2009:04), the results show that the proposed hybrid model provides a coherent long-run relation to explain the dollar–yen exchange rate as opposed to the conventional monetary model.