Idiosyncratic Risk Puzzle Solved: Not All Investors Are The Same
Nov 20th, 2011 | Filed under: Alpha Strategies, CAPM / Alpha Theory, Performance, Analytics & Metrics, Today's Post
Intuition (codified by many models) suggests that investors have to be bribed to accept risk, so that there ought to be a positive link for any given class of security between the amount of risk, and thus the measurement of volatility, on the one hand, and expected return on the other. A puzzle arises, then, from empirical research indicating that “idiosyncratic” volatility, that is, the volatility due to the characteristics of a specific security, is negatively correlated with return once one passes the mid-point of the range of volatility.




