Antti Ilmanen: The Building Blocks of Long-Run Returns (EP.202)

Episode Summary

Executive Summary: Auntie Ilmanen argues that historical returns are useful only when expected returns are stable, and that today’s high valuations imply low future returns across equities, bonds, real estate, and some alternatives. He explains why contrarian timing is hard, why private assets and credit offer less premium than many assume, and why patience, diversification, and cost discipline matter more in a low-return world.

Main Topics: Expected returns and the limits of historical data (Priority: 5/5): Ilmanen explains that long-run averages can help when premia are stable, but valuation changes and time-varying expected returns make history a noisy guide. Yield-based forward-looking estimates are usually better anchors for planning. Equity valuations and low future returns (Priority: 5/5): US equity valuations are rich by historical standards, implying roughly 3% real expected returns using inverse CAPE logic. Ilmanen argues that strong recent equity performance borrowed returns from the future via valuation expansion. Contrarian timing, international equities, and value signals (Priority: 4/5): He distinguishes market timing, country allocation, and factor investing, warning that contrarian signals can be profitable but have weak hit rates and require patience. He also says non-US markets are cheaper than the US. Bonds, credit, and duration timing (Priority: 4/5): Bonds are not 'dead' because they still provide term premium and diversification, though timing duration is difficult. He also sees a real but modest credit premium, with some role for corporate bonds beyond Treasuries. Commodities, rebalancing, and diversification return (Priority: 4/5): Single commodities have near-zero long-run geometric returns, but diversified commodity baskets can earn a positive premium through volatility reduction and rebalancing bonus, not just conventional risk premia. Illiquid assets, smoothing services, and fee pressure (Priority: 5/5): Private equity and direct real estate may not earn large illiquidity premia because investors implicitly pay for smoothing and lack of mark-to-market. He expects valuation effects first, with fee pressure lagging realized return disappointment. Factor premia: value, trend, defensive, carry, and investor behavior (Priority: 5/5): Ilmanen reviews style premia, noting value’s unusually severe drawdown, trend following’s crisis behavior, the defensive/quality anomaly, and how carry overlaps with value in some markets. Investor impatience and overconfidence often undermine implementation.

Key Arguments: Historical averages are only reliable when expected returns are stable; otherwise yield- or valuation-based estimates are better. Current US equity valuations imply very low real expected returns, around 3%, because high prices have already pulled future returns forward. Contrarian strategies can work over long horizons, but the hit rate is poor and timing is extremely difficult; patience is essential. Bonds still matter for income and diversification, even if duration timing is hard and inflation/rates have hurt recent performance. Credit likely has a modest positive premium, though some of the historical evidence is noisy and should be treated cautiously. Commodity basket returns can be positive because diversification reduces volatility drag and creates a rebalancing bonus. Private assets offer smoothing and liquidity convenience, so their illiquidity premium is likely smaller than commonly advertised. As expected returns fall, investors must either save more or take more risk to hit the same retirement goal. Value’s poor performance is partly explained by structural shifts toward digital businesses and a growth-stock bubble, not just interest rates. Behavioral discipline matters: the best strategies fail if investors abandon them during drawdowns or chase recent winners at reversal horizons.

Data Points: US equity real expected return (inverse CAPE): ~3% - Ilmanen’s rough estimate using the Shiller CAPE around 33, implying 100/33 ≈ 3% real return. Shiller CAPE level: ~33 - Referenced as the current valuation level for US equities. US equity realized real return over last 10 years: 14% - Used as an example of how valuation expansion boosted realized returns. Windfall gain from CAPE expansion: ~7% per year - Estimated contribution from CAPE moving from about 20 to 40 over the last decade. Historical US equity expected real return 40 years ago: ~10% - Illustrates how expected returns have fallen as valuations became richer. Non-US equity valuations: Cheaper than US - He says developed and emerging markets look cheaper than the US on CAPE and similar metrics. Bond yield environment: Still low, but less extreme than before - Discussed as a reason bonds may now have more upside than people think, though duration timing remains difficult. Commodity individual volatility: Near 30% - Used to explain why individual commodities have low geometric mean returns due to volatility drag. Commodity portfolio volatility: Below 20% - Diversification reduces volatility and increases compound returns in a basket of commodities. Commodity basket premium: ~3% - Attributed to diversification return/rebalancing bonus rather than a pure risk premium. Value drawdown: Roughly 5 years in the recent episode - He argues the recent value slump is severe but often overstated as a 14-15 year drawdown depending on methodology. Savings rate example: 8% to ~15% of paycheck - A 2% sustained drop in expected returns nearly doubles the savings rate required for a similar retirement outcome. CAPE independent observations: ~15 observations over 150 years - Shows how limited the statistical power is even with long historical series. Value spread: Very high since 2020, rivaling 1999 - He views the current relative valuation between value and growth as historically attractive for value. Trend-following horizon: Works best over months to about one year - He contrasts this with multi-year mean reversion horizons where momentum-style behavior becomes a mistake.

Pivotal Quotes: "view your portfolio broadly and rarely" — Auntie Ilmanen: Practical advice for maintaining patience and avoiding line-item fixation when investing through drawdowns. "if market timing is a sin, then at most sin a little" — Auntie Ilmanen: Summarizes the limited reliability of contrarian timing signals and the need for humility. "cost-efficient investing is not minimizing costs, it’s still maximizing risk-adjusted, expected net returns" — Auntie Ilmanen: His framing for evaluating fees in a low-return environment.

Implications: Listeners should expect lower returns from many assets than historical averages suggest, save more, diversify broadly, and resist performance chasing. Institutions may keep reaching for illiquid or alternative assets, but the premium there may be smaller than marketed and patience will remain the main edge.