Knowledge that Transforms

In the intertemporal asset pricing model, investments in spot foreign currencies involve time-varying risk proportional to the conditional covariance of the value of the position with the intertemporal marginal rate of substitution of domestic currency. We detect such risk premia in deviations from uncovered interest rate parity using weekly spot currency prices and Eurocurrency interest rates. Our tests use the conditional capital asset pricing model with a world equity index as benchmark to represent aggregate wealth.

This paper extends earlier work on unsustainable monetary policies by endogenizing the regime switch that ultimately restores sustainability. Within this framework we analyse exchange rate based stabilization programmes and show how constraints on Central Bank borrowing during an exchange crisis influence timing and nature of the post-collapse equilibrium. Such constraints introduce non-neutralities; more restrictive pre-collapse credit policies increase the post-collapse inflation rate. External shocks can destroy consistency between fiscal programmes and inflation targets, causing reserve losses, exchange rate changes and higher inflation. Balance of Payments crises are the mechanism through which fiscal imbalances translate into higher inflation rather than an alternative explanation of it.

This paper reexamines the empirical evidence for mean-reverting behavior in stock prices. Comparison of data before and after World War II shows that mean reversion is entirely a prewar phenomenon. Using randomization methods to calculate significance levels, the authors find that the full sample evidence for mean reversion is weaker than previously indicated by Monte Carlo methods under a normal assumption. Further, the switch to mean-averting behavior after the war is about to be too strong to be compatible with sampling variation. The authors interpret these findings as evidence of a fundamental change in the stock returns process. Copyright 1991 by The Review of Economic Studies Limited.

We develop a model of repeated product improvements in a continuum of sectors. Each product follows a stochastic progression up a quality ladder.

This paper examines the empirical relation between nominal exchange rates and macroeconomic fundamentals for five major OECD countries between 1974 and 1987. Five theoretical models of exchange rate determination are considered. Potential non-linearities are examined using a variety of parametric and nonparametric techniques. The authors find that the poor explanatory power of the models considered cannot be attributed to nonlinearities, arising from time-deformation or improper functional form. Copyright 1991 by The Review of Economic Studies Limited.

This paper examines whether middle age American households purchase adequate amounts of life insurance. The analysis is based on SRI International's 1980, 1982, and 1984 surveys of the financial positions of American households. Our findings indicate that a significant minority of American wives are highly underinsured with respect to the possible deaths of their husbands. We find that 25 to 30% of wives are inadequately insured, by which we mean that they would suffer a loss in their rate of sustainable consumption of at least 30% in the event of being widowed. These findings on inadequate life insurance are even more striking if one focuses on those households in which over half of the couple's present expected value of resources is dependent on the husband's survival. The results of this paper together with those of the related literature strongly suggest that raising the share of social security benefits that are paid to surviving spouses as well as increasing employer-provided group life insurance could have a very considerable impact on the alleviation of poverty among widows, especially elderly widows.

In this paper, we present a simple model which relates security returns to three components: an expected return, a bid-ask error, and white noise. The relative importance of the various components is empirically assessed, and the model's ability to explain the various time-series properties of individual security and portfolio returns is tested. Time-varying expected returns and bid-ask errors are found to explain substantial proportions (up to 24%) of the variance of security returns. We also reconcile the typically negative autocorrelation in security returns with the strong positive autocorrelation in portfolio returns.

This paper asks whether market fundamentals can explain the recent run-up and decline of Japanese equity values and price-earnings ratios. Accounting differences explain about half of the long-run disparity between U.S. and Japanese P/Es. For example, if Japanese firms used U.S. accounting rules, the Japanese P/E ratio would have been 32.6, not 53.7, in 1989. Accounting differences cannot, however, explain the doubling of this ratio in 1986, nor its decline in 1990. Similarly, we are unable to isolate changes in required stock returns or growth expectations that are large enough to explain recent Japanese stock price movements.

We argue that hedging and risk management activities of modern corporations arise as a direct consequence of attempts to create shareholder wealth through financial innovation. We formalize this argument by examining in detail corporate issues of foreign currency exchange warrants. We then focus on one multiple issuer to demonstrate how the foreign exchange risk created by the sale of the warrants can be eliminated. The use of off-balance-sheet risk management techniques to lock in the benefits of selling overpriced securities raises questions about the information content of innovative corporate financing decisions.

This paper extends previous work on the information in the U.S. term structure at longer maturities to Britain, West Germany, and Switzerland. We find strong evidence that the term structure does have significant ability to forecast changes in inflation, particularly at long maturities. On the other hand, the ability of the term structure to forecast changes in one-year interest rates is somewhat weaker; only at the very longest horizon (five years) is there significant forecasting ability for interest-rate changes.