5min chapter

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Jonathan Berk and Jules van Binsbergen: The Arithmetic of Active Management, Revisited (EP.220)

The Rational Reminder Podcast

CHAPTER

How to Use Factor Portfolios as the Next Best Investment Opportunity?

Jonathan: If you believe the facts of portfolios are really a risk measure, then it's perfectly firn to use em. But there's not a shred of evidence these things are risk right? It's just an invented term. You notice it has a positive excess return n you call it risk, right? So i think that is, you know, academics getting papers published. The second reason to use the facts of mimicing portfolios is to say, forget about where they measure risk. They are the next best alternative investment opportunity. And so we think that the counterfactor investment opportunity set is a perfectly reasonable bar in many ways.

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