📖Jeremy Grantham
Probabilistic Thinking
Think in probabilities, not certainties.
Think in probabilities, not certainties. Every investment has a range of possible outcomes. Weight your decisions by the expected value of each scenario.
🏠 Everyday Analogy
📖 Core Interpretation
In Probabilistic Thinking, Jeremy Grantham focuses on the gap between price and value. Returns come from paying less than what a business is worth, not from guessing short-term market moves.
💎 Key Insight：Expected value calculations guide rational decisions.
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❓ Why It Matters
Ignoring valuation turns even good companies into poor investments. Overpaying compresses future returns and leaves little margin when assumptions are wrong.
🎯 How to Practice
Estimate intrinsic value with conservative assumptions, set clear buy ranges, and act only when price offers a meaningful discount with acceptable downside.
⚠️ Common Pitfalls
Confusing a low price with true cheapness
Using one metric without business context
Overly optimistic assumptions that erase margin of safety
📚 Case Studies
1
Dot-Com Bubble Warning (2000)
Grantham publicly warned in 1998–2000 that tech stocks were in a massive bubble, reducing GMO client exposure to overvalued growth and internet shares.
✨ Outcome：Clients underperformed during the final surge, but avoided most of the 2000–2002 crash and preserved substantial capital.
2
Housing and Credit Bubble Call (2007)
Grantham labeled 2005–2007 a global housing and credit bubble, slashing exposure to risky mortgage-linked and leveraged financial assets before the crisis hit.
✨ Outcome：Underperformance before mid-2007, then strong relative results during the 2008 crash as portfolios were less exposed to collapsing financials.
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