The profitability of carry trades

The uncovered interest parity (UIP) condition suggests that carry trades whereby investors borrow in the low interest rate currency and invest in the high interest rate currency should not result in excess profits over the long run. In this paper, we test the significance of the conventional empirical failure of UIP condition. Using the four bilateral pound parities we fail to detect significant excess carry trade profits for the yen, euro and swiss franc–pound parities. The only parity for which the carry trade consistently makes excess profits is the dollar–pound parity. This result is somewhat surprising as this is the currency pair with the lowest interest rate differential. We are extremely grateful for the anonymous referee’s comments on this paper.     

Uncovered Interest Parity,Forward Guidance and the Exchange Rate

Under uncovered interest parity (UIP), the size of the effect on the real exchange rate of an anticipated change in real interest rate differentials is invariant to the horizon at which the change is expected. Empirical evidence using U.S., euro area and UK data points to a substantial deviation from that invariance prediction: expectations of interest rate differentials in the near (distant) future are shown to have much larger (smaller) effects on the real exchange rate than is implied by UIP. Some possible explanations are discussed.     

Time-varying international diversification and the forward premium

This paper reproduces the slope of the uncovered interest rate parity (UIP) regression for ten country pairs within one standard deviation under rational expectations. We propose an infinite horizon dynamic stochastic general equilibrium model with incomplete markets. Heterogeneous investors experience varying risk aversion as a result of habit formation.The underlying mechanism of the model relies on varying international diversification in the investors' portfolio choice decision. In response to their changing habit levels, investors' hedging desire varies over time. This leads to adjustments in interest rates. The habit-induced investment decisions are negatively correlated with movements in the exchange rate. This results in a negative correlation between interest rates and expected exchange rates, as implied by a negative UIP slope.Depending on the magnitude of habits, the model is capable of reproducing positive as well as negative UIP slopes, as seen empirically in the data.     

The role of covered interest parity in explaining the forward premium anomaly within a nonlinear panel framework

This paper investigates the dynamic properties of uncovered interest parity (UIP) depending on deviations from covered interest parity (CIP) in a nonlinear panel framework. By employing a panel smooth transition regression model, the threshold level of the CIP deviation in which UIP tends to hold is found to be outside the band of inaction where deviations from CIP would fail to be arbitraged away. This paper shows how reversals of UIP observed during the global financial crisis can be, to some extent, accounted for by funding liquidity constraints. Simulation experiments also suggest that the data-generating process from the nonlinear panel model can produce data consistent with the failure of UIP.     

Insured uncovered interest parity

The current literature suggests that uncovered interest parity (UIP) does not hold because of differences in risk in holding different currency denominated debt. We test whether this risk is related to sovereign credit risk in government bonds. We consider an insured uncovered interest parity relationship – that is, one where debt is insured with credit default swap (CDS) contracts. CDS rates help explain the UIP puzzle but have no predictive power for carry trade returns and currency movements.     

Differential risk premiums and the UIP puzzle

We respecify the uncovered interest rate parity (UIP) conditions by inverting the market price of the risk (Sharpe ratio) formula. Our empirical model provides new insight indicating that violations to the UIP stem from the existence of a risk premium in the exchange rates and from observed market return differentials being a noisy statistic of the markets’ expected return differentials in our respecified model. Using an integrated macro‐micro structure framework for expected market return differentials improves our model fit and the validity of UIP.     

Interest Rates and Exchange Rate Movements: Analyzing Short-term Investments in Long-term Bonds

Tests of the uncovered interest rate parity (UIP) are subject to various data problems when long-term interest rates are applied: due to the long investment period, time intervals for measuring exchange rate movements are usually overlapping and therefore not independent. This shortfall can be prevented by considering short-term investments in long-term bonds instead of investments to maturity. This article analyzes the explanatory power of long-term interest rates with regard to 1- and 3-month exchange rate movements by relating return differences from 1- and 3-month investments in domestic and foreign 10-year government bonds to nine different exchange rates. From a Swiss perspective, there is only weak support for an interrelation between return differences and the corresponding exchange rate movements, whereas from a US perspective, the resulting estimates are much more in line with UIP.The reader may for instance consider Engel (1996) and Froot and Thaler (1990).     

Predicting exchange rate cycles utilizing risk factors

This paper attempts to predict the cyclical behavior of exchange rates by using five risk factors, viz., violations of uncovered interest rate parity (UIP), relative purchasing power parity (RPPP) and pseudo-parity for equity returns, relative (cross-country) TED spreads and relative term spreads. These factors are found to forecast periods of depreciation or appreciation and subsequent reversals. The estimates based on a dynamic probit model reveal that violations of UIP, RPPP and equity market pseudo-parity exhibit predictive power for currency cycles albeit only at short horizons. The proposed framework can be utilized by policy makers to smoothen the resulting currency misalignment and by investors to form trading strategies and hedge their positions as well as re-balance their carry trade positions.     

Uncovered interest parity, monetary policy and time-varying risk premia

In a recent paper, McCallum argued that monetary-policy behavior can be responsible for the apparent empirical failure of uncovered interest parity (UIP). The present paper investigates whether optimizing policy behavior can account for the observed regime-dependence of UIP evidence. The main result is that the tradeoff between interest-rate and exchange-rate stability is a potential candidate for the explanation of the apparent failure of UIP and that the consideration of policy reactions can explain why deviations from UIP differ systematically by the exchange-rate regime.     

Currency futures-spot basis and risk premium

This paper explores the usefulness of currency futures-spot basis in predicting spot rate changes and currency futures returns. We conjecture that the currency risk premium may be an important component of the basis for long-maturity futures contracts, but may not be so for short-maturities. Thus, the basis of long-maturity contracts cannot predict the spot rate changes between now and maturity, rejecting uncovered interest rate parity (UIP), but can predict currency futures returns, which are solely determined by the risk premium. Conversely, the basis of the short-maturity contracts can predict the spot rate changes between now and maturity, validating the UIP, but cannot predict currency futures returns. Empirical tests support these conjectures for the Japanese, British, Swiss, and German currencies over the last two decades. The results are also consistent with Longstaff [Longstaff, F., 2000. The term structure of very short-term rates: new evidence for the Expectation Hypothesis. Journal of Financial Economics 58, 397–415], who shows that the Expectations Hypothesis holds at the very short end of the term structure of interest rates.     

A Liquidity-Based Resolution of the Uncovered Interest Parity Puzzle

A new monetary theory is set out to resolve the “uncovered interest parity (UIP)” puzzle. It explores the possibility that liquidity properties of money and nominal bonds can account for the puzzle. A key concept in our model is that nominal bonds carry liquidity premia. We show that the UIP can fail to hold under the economic environment where collateral pledgeability and/or liquidity of nominal bonds and/or collateralized credit-based transactions are relatively bigger. Our liquidity-based theory can help understanding many empirical observations that risk-based explanations find difficult to reconcile with.     

Testing PPP Hypotheses between Japan and the Six G7 Countries

The paper examines the purchasing power parity(PPP) theory of the foreign exchange rate of the yenagainst the currencies of the six G7 countries. We usethe error-corrected five-dimensional vectorautoregressive (VAR) model with structural changes inthe trend function. The data cover the period of thepost-Breton–Woods floating exchange rate system. Theresults reveal that the PPP relation alone determinesthe exchange rates for the USA, France, Germany, andItaly, while a linear combination of PPP and uncoveredinterest rate parity (UIP) relations determines that for Canada. Ina model without trend breaks, the PPP relations holdonly for Germany, which indicates that a correctspecification of the sampling distribution of data isimportant. The one-step prediction based on the errorcorrection model (ECM) outperforms the random walkmodel. The ECM is useful to predict the out-of-samplebehaviors of the exchange rates.     

An Exchange Rate Model with Market Pressures and a Contagion Effect

The model we propose includes variables accounting for the behavioral aspects of decision-making in the currency markets, namely the contagion effect between countries in the same region. It combines the classical purchasing power parity (PPP) and uncovered interest rate parity (UIP) hypotheses with the effects of risk aversion in financial markets and of currency market pressures.

The results based on the Polish data confirm that the currency market instabilities arise not only from fundamental factors such as economic activity and the country’s balance of payments, but also from the contagion effect brought about by investors’ tendency to view Poland and its neighbors, the Czech Republic and Hungary, as one group.     

An empirical study of nonlinear adjustment in the UIP model using a smooth transition regression model

This study considers the nonlinear relationship between the expected exchange rate change and the interest rate differential, using STR models (ESTR and LSTR), with Sharpe ratios, interest rate differentials and exchange rate volatilities as the transition variables. The results generally conclude that UIP holds with the larger Sharpe ratio and higher exchange rate volatility regimes, which is consistent with the transaction costs and limits to speculation hypotheses. However, the interest rate differential (which is generally not used much as a transition variable) when used in this study results in a failure to support UIP in the upper regime, which suggests it is the risk not the pure return that determines the transition.     

Currency risk premia and uncovered interest parity in the International CAPM

Zero-investment uncovered interest parity (UIP) portfolio positions provide perfect factor-mimicking portfolios for currency risk in the International CAPM context. Their returns are the currency risk premia. Since the UIP positions on average provide low returns, the currency risk premia must be low so that currency risk appears not to be priced in an unconditional model. However, previous research has shown that UIP returns are predictable and may be quite substantial conditionally. We use this observation to generate a specific conditional version of the International CAPM. A GMM approach shows that the conditional model performs well, while the unconditional International CAPM is (marginally) rejected. The paper thus argues that previous rejections of the International CAPM stem from the fact that currency risk premia are by nature low over extended periods of time and do not provide evidence against the International CAPM.     

Co-integrating currencies and yield differentials

This study investigates the relationship between currencies and interest rates of different maturity horizons. The real exchange rate is found to depend both on short-term real domestic and foreign interest rate difference and on long-term real domestic and foreign interest rate difference. Co-integrating regressions of contemporaneous currency rates generate negative and significant coefficients for long-term rate differentials, consistent with uncovered interest parity. Therefore, the expectations hypothesis holds for long horizons. On the other hand, positive coefficients for real short-term interest rate differentials reveal the forward premium puzzle: the failure of uncovered interest parity for short-horizons. Results are partly driven by the very different risk characteristics of short-term bonds and foreign bonds.     

An exploration of the forward premium puzzle in currency markets

A standard empirical finding is that expected changes in exchangerates and interest rate differentials across countries are negativelyrelated, implying that uncovered interest rate parity is violatedin the data. This article provides new empirical evidence thatsuggests that violations of uncovered interest rate parity,and its economic implications, depend on the sign of the interestrate differential. A framework related to term structure modelsis developed to account for the puzzling relationship betweenexpected changes in exchange rates and interest rate differentials.Estimation results suggest that a particular term structuremodel can account for the puzzling empirical evidence.     

Exchange rate expectations and the pricing of Chinese cross-listed stocks

I show that the price discounts of Chinese cross-listed stocks (American Depositary Receipts (ADRs) and H-shares) to their underlying A-shares indicate the expected yuan/US dollar exchange rate. The forecasting models reveal that ADR and H-share discounts predict exchange rate changes more accurately than the random walk and forward exchange rates, particularly at long forecast horizons. Using panel estimations, I find that ADR and H-share investors form their exchange rate expectations according to standard exchange rate theories such as the Harrod-Balassa-Samuelson effect, the risk of competitive devaluations, relative purchasing power parity, uncovered interest rate parity, and the risk of currency crisis.     

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.     

The Federal Reserve,the Emerging Markets,and Capital Controls: A High‐Frequency Empirical Investigation

In this paper, I use weekly data from seven emerging nations—four in Latin America and three in Asia—to investigate the extent to which changes in Fed policy interest rates have been transmitted into domestic short‐term interest rates during the 2000s. The results suggest that there is indeed an interest rates “pass‐through” from the Fed to emerging markets. However, the extent of transmission of interest rate shocks is different—in terms of impact, steady state effect, and dynamics—in Latin America and Asia. The results also indicate that capital controls are not an effective tool for isolating emerging countries from global interest rate disturbances. Changes in the slope of the U.S. yield curve, including changes generated by a “twist” policy, affect domestic interest rates in emerging countries. I also provide a detailed case study for Chile.