📖Jeremy Grantham

Multidisciplinary Thinking

🌳 Advanced★★★★★

Use insights from multiple disciplines for better decisions.

💬

Draw insights from multiple disciplines — psychology, history, mathematics, and science — to build a lattice of mental models for better investment decisions.

— GMO Quarterly Letters,2017

🏠 Everyday Analogy

Emotions in markets are like steering on a wet road: the harder you jerk the wheel, the more likely you lose control. Rules keep decisions stable.

📖 Core Interpretation

Jeremy Grantham highlights that many investment mistakes are psychological, not analytical. Managing behavior under stress is as important as finding ideas.
💎 Key Insight:Cross-disciplinary thinking reveals patterns invisible to specialists.

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❓ Why It Matters

In volatile markets, fear and greed push investors to buy high and sell low. A behavioral framework reduces avoidable, self-inflicted errors.

🎯 How to Practice

Pre-write decision rules, slow down trades during stress, and separate market emotion from business facts before adjusting positions.

⚠️ Common Pitfalls

Following crowd emotion at extremes
Mistaking confidence for certainty
Forcing trades to quickly recover losses

📚 Case Studies

1
Agricultural Commodity Tightness (2011)
Extreme weather, rising emerging‑market diets, and constrained arable land triggered sharp rises in grain and food prices, consistent with Grantham’s resource‑scarcity framework.
✨ Outcome:Ag, fertilizer, and farmland investments outperformed; volatility later normalized, but structural pressure on food systems remained evident to long‑term investors.
2
Dot-Com Bubble Restraint (1999)
Grantham avoided overvalued tech stocks despite client pressure and soaring Nasdaq indices, focusing on valuation discipline.
✨ Outcome:Underperformed during the mania, then strongly outperformed after the 2000–2002 crash as overpriced tech collapsed.

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