Of course, I also dismiss the idea that the alpha term in the equation has to be zero. Investment skill exists, even though not everyone has it. Only through thinking about risk- adjusted return might we determine whether an investor possesses superior insight, investment skill or alpha . . . that is, whether the investor adds value.
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Although I dismiss the identity between risk and volatility, I insist on considering a portfolio’s return in the light of its overall riskiness, as discussed earlier. A manager who earned 18 percent with a risky portfolio isn’t necessarily superior to one who earned 15 percent with a lower- risk ...
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