Antti Ilmanen - Understanding Return Expectations (S7E21)

In this episode, I speak with Antti Ilmanen, Principal and Global Co-head of the Portfolio Solutions Group at AQR Capital Management. Antti has long been one of the most thoughtful voices in the world of expected returns, having written not one, but two landmark books on the subject. But in his latest paper series, he returns to the topic with fresh urgency—probing the difference between objective and subjective expectations, and asking why even rational models can go so wrong in real time. We explore everything from CAPE ratios and market timing accusations, to why equity investors tend to extrapolate while bond investors expect mean reversion. We dig into how behavioral biases, valuation anchors, and structural shifts collide when forming capital market assumptions—and how Antti and the AQR team try to navigate that mess themselves. If you’re in the business of long-term forecasting or just curious why markets often act like they’ve never read the textbooks, this is a conversation you won’t want to miss. Please enjoy my conversation with Antti Ilmanen. 0:00 Introduction and Disclaimer 0:53 Welcoming Antti Ilmanen 3:00 Antti Ilmanen's Motivation for Latest Paper Series 5:09 Objective vs. Subjective Expected Returns 10:23 Analysts' Overoptimism and Market Behavior 15:19 Macro Surprises, Valuation Changes, and Market Rationality 20:25 CAPE in Investment Analysis and Addressing Its Critiques 29:13 Growth Extrapolation's Impact on Equity Returns 33:59 Capital Market Assumptions and Efficient Market Hypothesis 38:32 Expectations in Equity vs. Bond Markets 42:03 Mean Reversion in Rate Expectations and US Exceptionalism Debate 49:22 Asset Yields, Repricing, and AI Impact 54:11 Historical Data's Relevance for Future Expectations 57:02 Practical Implementation of Capital Market Assumptions 59:30 AQR's Approach to Capital Market Assumptions and Risks of Published Data 1:04:01 Future Topics in the Series and Revisiting Stock-Bond Correlation 1:12:12 Antti's Current Obsession Outside of Work 1:13:27 Closing Remarks

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