So here’s a game I’m playing a lot lately: dueling
Greek. No, I’m not finally fulfilling my
father’s long-dead wish that I attend
Of course, I understand what people are getting at. They’re suggesting that they’re after improved risk-adjusted return. But that’s where it gets dicey: how do you articulate risk in a PE context? And what’s the appropriate level of return per unit of risk?
As we all remember, alpha is the excess return of a portfolio relative to the return predicted by a portfolio of similar risk (expressed as beta). Said more elegantly (note the gratuitous equation inserted to gain credibility with the quants):
Portfolio alpha = Portfolio Return - (Risk Free Rate + Portfolio Beta * Equity Risk Premium)
So assuming a long-horizon nominal equity risk premium around 6.5% and an average nominal risk free rate of about 4.5%, a portfolio with a beta of one should have a return of about 11% and anything above that is alpha, sweet alpha. [We could quibble about time-varying premia and risk free rates, but the generic point is valid, no?] Here’s the catch: I just don’t believe that PE betas are anywhere close to one; on the buyout side, higher levels of debt implicitly raise beta while the venture guys have incredible volatility of outcomes.
Fortunately, most folks decide to play along with the spirit of the question and we typically get into good discussions of risk appetite, tolerance, and management. It’s always a stimulating chat, but people rarely answer my question directly. To be a sport, a GP once argued – with a grin – that the beta had to be less than 1 because most people thought the correlation of PE to the public markets was about 0.65. Without skipping a beat, he acknowledged that appraisal effects and stale prices made that number totally meaningless.
So, what is the beta of PE? Is it 1.25 (kinda like Vanguard’s small-cap Explorer fund)? Or more like 2.0? If it’s the former, you’ve got to generate net returns greater than about 13% to have positive alpha; if it’s the latter, your bogey is closer to 18%. [Interestingly, the time-worn PE goal of 500 bps of excess return probably implies a beta of about 1.75, which is about the beta exhibited by some public managers with concentrated portfolios].
At this point – like
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