Firms seem to care a lot about "risk management": the practice of hedging risks whether they are correlated with market risk or not. The standard reasons why widely held corporations might be averse to idiosyncratic risk are based on the principal-agent problem, bankruptcy costs, external...

We analyze bubbles and crashes in a model in which some investors are partially sophisticated. While the expectations of such investors are endogenously determined in equilibrium, these are based on a coarse understanding of the market dynamics. We highlight how such investors may endogenously...

Based on intraday data for a large cross section of individual stocks, we find that the risk component of stock returns exhibits strong intraday momentum, and this pattern holds from previous market close to 10:00, and every half hour since then until market close at 16:00. Strikingly, the...