We characterize jump dynamics in stock market returns using a novel series of intraday prices covering over 80 years. Jump dynamics vary substantially over time. Trends in jump activity relate to secular shifts in the nature of news. Unscheduled news often involving major wars drives jump...

This paper addresses the economic value of estimated portfolio rules under general utility. Incorporating estimation risk magnifies errors associated with mean-variance approximations to the economic value of portfolio rules. In fact, for some preference specifications, including CRRA utility,...

We compare the accuracy of cost of equity estimates based on leading factor models to two simple alternatives: the asset mean and the market mean. The market mean proves to be a serious competitor to traditional implementations of factor models even if the underlying factor model is true....