The efficient market hypothesis and identification in structural VARs

Structural vector autoregression (SVAR) models are commonly used to investigate the effect of structural shocks on economic variables. The identifying restrictions imposed in many of these exercises have been criticized in the literature. This paper extends this literature by showing that, if the SVAR includes one or more variables that are efficient in the strong form of the efficient market hypothesis, the identifying restrictions frequently imposed in SVARs cannot be satisfied. The authors argue that this analysis will likely apply to VARs that include variables that are consistent with weaker forms of the efficient market hypothesis, especially when the data are measured at the monthly or quarterly frequencies, as is frequently the case.Macroeconomics ; Econometric models

The efficient market hypothesis and identification in structural VARs

Structural vector autoregression (SVAR) models are commonly used to investigate the effect of structural shocks on economic variables. The identifying restrictions imposed in many of these exercises have been criticized in the literature. This paper extends this literature by showing that if the SVAR includes one or more variables that are efficient in the strong form of the efficient market hypothesis, the identifying restrictions frequently imposed in SVARs cannot be satisfied. We argue that our analysis will likely apply to VARs that include variables that are consistent with the weaker form of the efficient market hypothesis, especially when the data are measured at the monthly or quarterly frequencies, as is frequently the case.Macroeconomics ; Econometric models

The dynamic relationship between the federal funds rate and the Treasury bill rate: an empirical investigation

This article examines the dynamic relationship between two key U.S. money market interest rates - the federal funds rate and the 3-month Treasury bill rate. Using daily data over the period 1974 to 1999, we find a long-run relationship between these two rates that is remarkably stable across monetary policy regimes of interest rate and monetary aggregate targeting. Employing a non-linear asymmetric vector equilibrium correction model, which is novel in this context, we find that most of the adjustment towards the long-run equilibrium occurs through the federal funds rates. In turn, there is strong evidence for the existence of significant asymmetries and nonlinearities in interest rate dynamics that have implications for the conventional view of interest rate behavior.Interest rates ; Arbitrage ; Treasury bills

The empirical failure of the expectations hypothesis of the term structure of bond yields

This paper tests the expectations hypothesis (EH) using US monthly data for bond yields spanning the 1952-2003 sample period and ranging in maturity from 1 month to 10 years. We apply the Lagrange multiplier test developed by Bekaert and Hodrick (2001) and extend it to increase the test power: (a) by introducing economic variables as conditioning information; and (b) by using more than two bond yields in the model and testing the EH jointly on more than one pair of yields. While the conventional bivariate procedure provides mixed results, the more powerful testing procedures suggest rejection of the EH throughout the maturity spectrum examined. ; Earlier titles: Testing the expectations hypothesis: some new evidence, New evidence on the expectations hypothesis of the term structure of bond yieldsRational expectations (Economic theory)

The Predictive Information Content of External Imbalances for Exchange Rate Returns: How Much Is It Worth?

This paper examines the exchange rate predictability stemming from the equilibrium model of international financial adjustment developed by Gourinchas and Rey (2007). Using predictive variables that measure cyclical external imbalances for country pairs, we assess the ability of this model to forecast out-of-sample four major US dollar exchange rates using various economic criteria of model evaluation. The analysis shows that the model provides economic value to a risk-averse investor, delivering substantial utility gains when switching from a portfolio strategy based on the random walk benchmark to one that conditions on cyclical external imbalances.foreign exchange; predictability; global imbalances; fundamentals.

Federal Funds Rate Prediction

Recent research has reported that both the federal funds rate futures market and the federal funds target contain valuable information for explaining the behavior of the US effective federal funds rate. A parallel literature on interest rate modelling has recorded evidence that the dynamics of interest rates displays significant regime-switching behavior. In this paper we produce out of sample forecasts of the federal funds rate at horizons up to 8 weeks ahead using linear and nonlinear, regime-switching equilibrium correction models of the funds rate and employing both point and density measures of forecast accuracy. We cannot discriminate among the models considered in terms of point forecast accuracy. However, in terms of density forecast accuracy, we find that the term structure model of the federal funds futures rate is significantly better than the other models considered, and that regime-switching models provide a substantial forecasting improvement relative to their linear counterparts and relative to individual series of the futures rate.federal funds rate, term structure of interest rates, forecasting, nonlinearity

The expectation hypothesis of the term structure of very short-term rates: statistical tests and economic value

This paper re-examines the validity of the Expectation Hypothesis (EH) of the term structure of US repo rates ranging in maturity from overnight to three months. We extend the work of Longstaff (2000a) in two directions: (i) we implement statistical tests designed to increase test power in this context; (ii) more importantly, we assess the economic value of departures from the EH based on criteria of profitability and economic significance in the context of a simple trading strategy. The EH is rejected throughout the term structure examined on the basis of the statistical tests. However, the results of our economic analysis are favorable to the EH, suggesting that the statistical rejections of the EH in the repo market are economically insignificant.Interest rates

The market for lemmings: The herding behavior of pension funds

Using a unique dataset that covers UK defined-benefit pension fund asset allocations over the past 25 years, we provide robust evidence that pension funds display strong herding behavior, and tend to herd in subgroups defined by fund size and sponsor type. We also show that, while pension funds tend to switch from equities to bonds as their liabilities mature, they mechanically rebalance their portfolios in the short term. Finally, we find that their price impact is neither persistent nor stabilizing, and that there are only small cross-sectional differences in returns across pension funds, consistent with their widespread herding behavior

Currency momentum strategies

We provide a broad empirical investigation of momentum strategies in the foreign exchange market. We find a significant cross-sectional spread in excess returns of up to 10% p.a. between past winner and loser currencies. This spread in excess returns is not explained by traditional risk factors, it is partially explained by transaction costs and shows behavior consistent with investor under- and over-reaction. Moreover, crosssectional currency momentum has very different properties from the widely studied carry trade and is not highly correlated with returns of benchmark technical trading rules. However, there seem to be very effective limits to arbitrage which prevent momentum returns from being easily exploitable in currency markets