📖Joel Greenblatt
Systematic Approach
Rules remove emotion and force discipline.
Use a systematic, rules-based approach to remove emotion from investing. Stick to the system.
🏠 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：Human emotions sabotage investing. We panic in downturns and chase performance in rallies. A systematic, formula-based approach forces you to buy when others are fearful and sell when they're greedy. Rules prevent the psychological biases that destroy returns. The magic formula works not because it's complex, but because it's unemotional and consistent.
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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.
🎙️ Master's Voice
The Magic Formula works. But you have to stick with it.
Greenblatt found that most investors abandon the strategy during underperformance. Consistency is key.
⚔️ Practical Guide
✅ Decision Checklist
- Am I sticking with my strategy?
- Am I abandoning during underperformance?
- Is consistency my edge?
📋 Action Steps
- Commit to your strategy
- Stay through underperformance
- Trust the long-term
🚨 Warning Signs
- Strategy abandonment
- Short-term focus
- Inconsistency
⚠️ Common Pitfalls
Having opinions without execution criteria
Reviewing outcomes but not decisions
Abandoning rules during volatility spikes
📚 Case Studies
1
Buying beaten-down retailers (2005)
Applied the Magic Formula to select a small-cap retailer with high ROIC and low EV/EBIT. Stock was widely ignored and priced for continued decline.
✨ Outcome：Business fundamentals improved, valuation normalized, and the stock approximately doubled over three years.
2
Post-crisis quality bargains (2009)
Used systematic value screen after 2008 crisis to buy high-ROIC industrial and consumer firms trading at single-digit earnings multiples.
✨ Outcome：As panic subsided, multiples re-rated upward and earnings recovered, producing strong double-digit annualized returns over the next five years.
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