Pastor and Stambaugh (2012) demonstrate that from a forward-looking perspective, stocks are more volatile in the long run than they are in the short run. We investigate how the economic constraint of non-negative equity premia aspects predictive variance. When investors expect non-negative...

Since Lee and Swaminathan (2000) find that high-volume stocks tend to have high stock momentum, there have been several studies investigating this phenomenon, but none of them have reached a firm conclusion about what the underlying driver is. In this paper, we empirically test two competing...