📖David Swensen
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, David Swensen 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
Staying the Course in the Global Financial Crisis (2008)
Equities, REITs, and commodities plunged over 40% while Treasuries and high‑quality bonds rallied, severely testing diversified portfolios.
✨ Outcome：Maintained target allocations and rebalanced into falling assets, leading to strong gains as markets recovered over the following years.
2
Dot‑Com Bust and Diversified Equity Exposure (2000)
Tech and growth stocks collapsed after the late‑1990s bubble, while broad value, international, and small‑cap exposures fared better.
✨ Outcome：Avoided concentrated tech bets, kept diversified long‑term allocations, and benefited as non‑bubble equities and later markets recovered.
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