Jensen (1968). proposed a very influential idea: when assessing mutual fund performance, we should compare funds only after accounting for the risks they take (rather than simply comparing returns). To see his argument, draw a SML, and put one dot above the SML (call it A) and one dot below it (call it B) while A and B have the same beta. (a) Describe the investment opportunities here. Buy B and sell A in a way that the portfolio has zero market beta Buy A and sell B in a way that the portfolio has zero market beta Just buy A to reach the highest possible return