📖Duan Yongping

Sell Discipline Rules

🌿 Intermediate★★★★★

Follow pre-defined sell criteria without emotion. 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. Duan Yongping advocates a repeatable process: define criteria, execute consistently, and review decisions against evidence. Process quality drives outcome consistency. Key insight: Disciplined selling prevents emotional decision-making. 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

💬

Have clear, pre-defined sell criteria. Sell when: your thesis is broken, valuation is fully realized, or a significantly better opportunity appears.

— Duan Yongping Interview，2021

🏠 Everyday Analogy

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

📖 Core Interpretation

Duan Yongping advocates a repeatable process: define criteria, execute consistently, and review decisions against evidence. Process quality drives outcome consistency.
💎 Key Insight：Disciplined selling prevents emotional decision-making.

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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
Apple during Global Financial Crisis (2008)
Amid the 2008 crisis, Apple’s share price fell sharply despite strong product momentum with iPhone and Mac sales.
✨ Outcome：Duan Yongping held and added, focusing on long‑term competitive advantage; Apple later compounded massively as the smartphone era took off.
2
Tencent Regulation and Gaming Freeze (2018)
China froze new game approvals, hitting Tencent’s core business and causing a steep share price decline and broad pessimism.
✨ Outcome：Duan maintained a long‑term view on Tencent’s ecosystem and network effects; the stock recovered as approvals resumed and business normalized.

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