How can three managers with the same return and the same volatility have completely different alphas?
Loading…
Sigma versus beta as the measure of risk
Record the security market line as the NPV cost of capital whose assumptions are re-checked at every use, and state that sigma prices only efficient portfolios on the capital market line.
Alpha as vertical distance from the line
Define alpha, note that skill lifts a manager above the line while anyone can reach the line, and place three managers with equal 15% return and 35% volatility but different betas.
A linear line from curved preferences
Contrast one investor's curved indifference curve with the linear relation between expected return and beta that aggregation produces for all securities.