This paper studies the interaction of the five most well-established calendar effects: the Halloween effect, January effect, turn-of-the-month effect, weekend effect and holiday effect. We find that Halloween and turn-of-the month (TOM) are the strongest effects fully diminishing the other three...

We provide theoretical and empirical arguments in favor of a concave shape for the security market line, or a diminishing marginal premium for market risk. In capital market equilibrium with binding portfolio restrictions, different investors generally hold different sets of risky securities....