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John Cochrane: Modern Modern Portfolio Theory (EP.169)

The Rational Reminder Podcast

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Is Return Predictability Imperative of Markets?

If returns or cash flows are not predictable, that means returns must be predictable. So does return predictability imply that markets are inefficient? Ah, well, that depends who you ask. You ask bob schiller, it's the nail in the coffin. If you ask jean faba, no, you got to be kidding. Read my 19 70 paper, thet said, the paper defining efficient markets,. That said, no return predictabili as me markets are inefficient. The last big moment like that was december two thousand and eight. Hum. What's going on? Is there a reason that everybody else out there is not buying stocks?"

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