📖Joel Greenblatt
Behavioral Bias Awareness
Know your behavioral biases to avoid them.
Know the common behavioral biases that trap investors: anchoring, confirmation bias, loss aversion, and herding. Awareness is the first step to prevention.
🏠 Everyday Analogy
📖 Core Interpretation
Joel Greenblatt treats survival as the first objective. Limiting permanent capital loss, controlling leverage, and avoiding single-point failure are prerequisites for long-term compounding.
💎 Key Insight：Awareness of biases is the first defense against them.
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❓ Why It Matters
A single large drawdown can erase years of progress. Risk control is not timidity; it is the operating system that keeps compounding alive.
🎯 How to Practice
Define downside scenarios before entry, cap position size, avoid fragile leverage, and maintain liquidity so mistakes remain survivable.
⚠️ Common Pitfalls
Equating volatility with all forms of risk
Oversized positions without an exit plan
Using leverage to compensate for uncertainty
📚 Case Studies
1
Spin-off: Liberty Media from AT&T (2000)
AT&T spun off Liberty Media, which appeared complex and overlooked. Greenblatt analyzed underlying assets and saw a large discount to intrinsic value.
✨ Outcome：Held through volatility; as the market recognized underlying media asset value, returns were multiples of initial investment over several years.
2
American Express Post-Asia/Russian Crises (2001)
American Express traded at depressed multiples after emerging market and Russian crises hurt travel and card volumes.
✨ Outcome：Greenblatt’s long-term view on brand strength and card economics led to holding; as conditions normalized, valuation rerated and produced strong multi-year gains.
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