📖Joel Greenblatt
Inversion Thinking
Invert problems to find insights forward thinking misses.
Instead of asking how to succeed, ask how to avoid failure. Inverting problems often reveals insights that forward thinking misses.
🏠 Everyday Analogy
📖 Core Interpretation
Joel Greenblatt advocates a repeatable process: define criteria, execute consistently, and review decisions against evidence. Process quality drives outcome consistency.
💎 Key Insight：Avoiding failure is often more productive than pursuing success.
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❓ Why It Matters
Without process, there is no reliable feedback loop. Structured execution and review improve decision quality over time.
🎯 How to Practice
Run a decision loop of research, thesis, execution, and post-mortem; document assumptions and update playbooks with evidence, not hindsight bias.
⚠️ Common Pitfalls
Having opinions without execution criteria
Reviewing outcomes but not decisions
Abandoning rules during volatility spikes
📚 Case Studies
1
Best Buy Value Opportunity (2011)
Best Buy’s price fell on fears of Amazon competition, pushing its earnings yield high relative to normalized profits and free cash flow.
✨ Outcome：Investors buying on elevated earnings yield saw strong recovery as buybacks, cost cuts, and stable demand lifted the stock in subsequent years.
2
American Express Spin-Off Opportunity (2004)
Greenblatt analyzed American Express when it was temporarily out of favor, trading below its intrinsic value based on earnings and returns on capital.
✨ Outcome：Invested at depressed prices, earning strong returns as earnings normalized and the market rerated the stock.
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