Selecting mutual funds is one of the most important jobs investors face. Yet the tool everyone reaches for, the Sharpe ratio, quietly assumes something most real people do not have: the ability, and willingness, to borrow at the risk free rate to lever the “best” fund up or down to their preferred risk level. Once borrowing is realistically restricted, the Sharpe ratio can stop lining up with what investors actually care about: utility. This paper argues that in this constrained world, the geome...
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