Neither existing theory nor prior empirical work can tell us the impact of non-normality on required sample sizes for Student-t tests of the mean in U.S. stock returns. Prior empirical work and bounds from a modified Berry-Esseen theorem do suggest, however, that the answer should vary with...

We uncover interesting opposite effects of jumps in stock prices on three kind of stock returns: close-to-close expected return, and its two components, namely overnight and intraday return, when heterogeneous investors are confronted with different types of news during trading hours and...