📖Peter Lynch

Six Categories of Stocks

🌿 Intermediate★★★★☆

Classify stocks to apply the right strategy to each. Without process, there is no reliable feedback loop. Structured execution and review improve decision quality over time. Run a decision loop of research, thesis, execution, and post-mortem; document assumptions and update playbooks with evidence, not hindsight bias. Peter Lynch advocates a repeatable process: define criteria, execute consistently, and review decisions against evidence. Process quality drives outcome consistency. Key insight: Different stock types require different expectations and holding periods. A process is like a pilot checklist: discipline prevents simple mistakes when pressure rises and keeps outcomes more repeatable.

Avoid misuse: Having opinions without execution criteria

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I place stocks in six general categories: slow growers, stalwarts, fast growers, cyclicals, turnarounds, and asset plays. Each requires a different strategy.

— *One Up On Wall Street*，1989

🏠 Everyday Analogy

A process is like a pilot checklist: discipline prevents simple mistakes when pressure rises and keeps outcomes more repeatable.

📖 Core Interpretation

Peter Lynch advocates a repeatable process: define criteria, execute consistently, and review decisions against evidence. Process quality drives outcome consistency.
💎 Key Insight：Different stock types require different expectations and holding periods.

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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
Chrysler Near Bankruptcy (1982)
U.S. automaker faced severe losses, layoffs, and survival doubts amid recession and Japanese competition.
✨ Outcome：Lynch viewed pessimism as overdone, invested as turnaround began, and profited when restructuring and new models restored confidence.
2
Fannie Mae Interest-Rate Panic (1987)
Rising interest rates sparked fear that Fannie Mae’s mortgage portfolio would implode, hammering the stock.
✨ Outcome：Lynch bought during panic, believing earnings power was intact; as rates stabilized and profits grew, the stock rebounded strongly.

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