📖Joel Greenblatt
The Magic Formula
High returns on capital plus low price equals value.
Buy good companies at bargain prices. Rank by earnings yield and return on capital, then buy the top ranked.
🏠 Everyday Analogy
📖 Core Interpretation
In The Magic Formula, Joel Greenblatt 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：The magic formula combines two factors: earnings yield (how cheap) and return on capital (how good). Good businesses earn high returns; cheap prices provide a margin of safety. Ranking stocks by both metrics systematically identifies undervalued quality companies. This simple approach has beaten the market over decades, despite its simplicity.
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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.
🎙️ Master's Voice
Buying good companies at bargain prices is the secret to making lots of money.
Greenblatt's Magic Formula combines quality and value. High-quality companies at low prices outperform over time.
⚔️ Practical Guide
✅ Decision Checklist
- Is this a good company?
- Is it a bargain price?
- Does it meet both criteria?
📋 Action Steps
- Screen for quality and value
- Require both, not just one
- Use the Magic Formula
🚨 Warning Signs
- Quality without value
- Value without quality
- Missing one criterion
⚠️ 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
American Express Recovery (2002)
Magic Formula ranked American Express highly after the tech bust when it was out of favor and trading at a low earnings yield.
✨ Outcome：Within several years, the stock delivered strong double‑digit annual returns as credit trends improved and valuation normalized.
2
Microsoft Post-Crisis Re-Rating (2009)
After the 2008 crisis, Microsoft screened well on return on capital and earnings yield, yet was viewed as a ‘value trap’ with slow growth.
✨ Outcome：Over the next five years, valuation multiples expanded and earnings grew, producing substantial outperformance versus the broader market.
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