Jeremy Grantham: ‘Almost Everything Looks More Attractive Than the US Equity Market’

Episode Summary

Executive Summary: Jeremy Grantham reflects on his career, value investing philosophy, and his deeply bearish long-term outlook on U.S. equities, AI hype, climate risk, resource limits, and toxic chemicals. He argues that markets are driven by valuation, bubbles, and career risk rather than true forecasting, while also highlighting shrinking populations and green energy as possible long-run escape valves.

Main Topics: Writing the book and Grantham’s long-term worldview (Priority: 5/5): Grantham explains how the book was assembled from quarterly letters, interviews, and prior writings, and how its scope intentionally balanced investment history with his broader concerns about society’s long-term risks. Value investing, frugality, and career risk (Priority: 5/5): He traces his investing instinct to wartime scarcity, Yorkshire/Quaker thrift, and a preference for bargains, then contrasts that with the reality that institutions often cannot afford to fight bubbles because of business and career risk. Market bubbles, valuation, and GMO’s discipline (Priority: 5/5): Grantham argues that markets repeatedly overshoot and then revert, describing his bubble framework, the tech and Japan episodes, and why GMO stayed disciplined even when it cost clients. Current market outlook and U.S. equity valuations (Priority: 5/5): He says the broad U.S. market remains one of the most expensive in history and that forward returns look poor, while foreign equities, emerging markets, and value areas are relatively more attractive. AI and SpaceX hype as modern bubble dynamics (Priority: 4/5): Grantham compares today’s AI and SpaceX enthusiasm to past speculative manias, warning that either valuations are absurd or the technology is transformative enough to pose serious societal risks. Lessons from early investing mistakes and indexing (Priority: 4/5): He recounts early speculative failures that were ideas ahead of their time, and explains his support for indexing based on zero-sum arithmetic and trading costs rather than market efficiency theory. Climate, toxins, demographics, and civilization risk (Priority: 5/5): Grantham reiterates that climate change, resource depletion, and chemical toxicity are existential long-term threats, but suggests falling fertility and cheap green energy could offer a path to sustainability.

Key Arguments: Markets do not reliably forecast the future; they extrapolate current conditions, which is why bubbles and crashes recur. Value investing is simple in principle—buy cheaper assets—but difficult in practice because career risk pushes institutions to stay invested in rising markets. GMO’s bearish calls were often early, but historical precedent shows that major bubbles always revert, even if they can overshoot dramatically first. The U.S. equity market looks exceptionally expensive relative to history, while many foreign markets and value segments are more attractive. AI is either severely overhyped or transformative enough to create extreme societal danger; either outcome is historically important. Indexing is justified by zero-sum math and trading costs, not by the claim that markets are fully efficient. The biggest long-term threats are climate change, resource scarcity, and toxicity, though declining fertility and cheap clean energy may eventually reduce pressure on the planet. Population decline may be the main optimistic force, but if fertility falls too fast, it could destabilize societies before ecological benefits arrive.

Data Points: Book interview material: 25 hours of interviews - Chancellor’s research process for the biography/book Source material: 1,200 pages - Quarterly letters provided as raw material for the book Current U.S. market outlook: As poor as almost any time in history - Grantham’s February 2025 view on broad-market long-run returns U.S. market rise since early 2025: About 25%–27% - He says the U.S. market rose sharply, helped by AI enthusiasm Market bubble definition: Two standard deviations away from trend - Grantham’s bubble framework for major equity markets Number of major equity bubbles studied: 26 - Historical sample used to test bubble reversion Reversion result: 26 of 26 reverted to trend - His claim that all studied bubbles eventually returned to prior trend Japan bubble valuation: 65x earnings - He cites Japan 1989 as the “mother of all equity bubbles” Tech bubble underperformance: 6% to 6.5% per year for 2.5 years - GMO’s relative underperformance during the late-1990s U.S. tech bubble Japan underperformance duration: Lost decade / perhaps 20 years - He uses Japan as the example of a prolonged bubble aftermath Indexing cost drag back then: About 2% a year - His example of trading and management fees making active management a negative-sum game Margin of safety on Bubble Detector: Stocks underperforming the whole market by more than 10% over 12 months - He describes GMO’s internal narrow-market/bubble indicator Global resource use: 1.7 planets - He says current income levels require more than one Earth to sustain Rich-American lifestyle scenario: 4 to 5 planets - His estimate of ecological demand if everyone consumed like rich Americans Fertility rate example: South Korea at 0.7 - Used as an example of extreme, potentially destabilizing population decline Replacement fertility: 2.1 children per woman - His benchmark for a stable population

Pivotal Quotes: "Question everything you hear. Look at the data." — Jeremy Grantham: His final practical lesson for investors and listeners "If you have to have an equity itch to scratch, I would have them. And then diversify as much as you can in that program." — Jeremy Grantham: Advice on where assets may still look relatively attractive versus U.S. equities "The only people who think you can have compound growth on a finite planet are madmen and economists." — Jeremy Grantham: His critique of growth assumptions and resource limits

Implications: Listeners should expect Grantham to remain bearish on U.S. equities and skeptical of AI/megacap exuberance, while paying attention to valuation, diversification, and long-term structural risks. His bigger message: markets reward patience, but civilization also faces real constraints.