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

The Rational Reminder Podcast

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What Does Return Predictability Tell Us About Cash Flow Prediction?

The information that is in valuation ratios about returns is about long horizon returns, not about something actionable or orno ready to start your high frequency trading a fund based on it. If the price is higher than current earnings or dividends, just mechanically, one of two things has got to happen. The price has got to come down, or the dividends that got togo. So that tells you something about the future. But it's not, we can't predict that in the next six months that the bubble will burst, and returns will be lower. It's a business cycle phenomenon. There's a businesscycle phenomenon, and then on top of that, a decade long phenomenon.

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