We apply the method of constrained asset share estimation (CASE) to test the mean-variance efficiency (MVE) of the stock market. This method allows conditional expected returns to vary in relatively unrestricted ways. The data estimate reasonably the price of risk, and, in some cases, the MVE...

The careening path of the dollar in recent years has shattered more than historical records and the financial health of some speculators. It has also helped to shatter faith in economists' models of the determination of exchange rates.We have understood for some time that under conditions of...