📖Duan Yongping
Review Your Investment Thesis
Regularly challenge your original investment thesis.
Regularly review whether your original reasons for owning a stock still hold. If the facts change, change your mind. Holding a broken thesis is the costliest mistake.
🏠 Everyday Analogy
📖 Core Interpretation
Duan Yongping frames investing as a compounding game. Time amplifies quality and discipline, while unnecessary activity often destroys long-horizon returns.
💎 Key Insight：Adapting to new facts prevents holding broken investments.
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❓ Why It Matters
Short-term noise often forces investors out before value is realized. Long-term discipline increases the odds that fundamentals, not emotions, drive outcomes.
🎯 How to Practice
Extend research and review horizon, reduce unnecessary turnover, and adjust only when intrinsic value, risk, or opportunity cost materially changes.
⚠️ Common Pitfalls
Calling it long term while never reviewing thesis
Overtrading and damaging compounding
Ignoring opportunity cost and alternatives
📚 Case Studies
1
BYD Executive Discipline (2010)
Duan Yongping sold or avoided BYD after observing governance and execution issues despite Warren Buffett’s investment and EV growth potential.
✨ Outcome：BYD stock became highly volatile; uneven profitability and governance worries validated Duan’s emphasis on management quality over popular narratives.
2
U.S. Financial Crisis vs. NetEase (2008)
Global markets crashed and China’s economy slowed, yet NetEase’s game business remained resilient despite fears of macro-driven collapse.
✨ Outcome：Duan focused on business fundamentals, not macro forecasts, held shares, and saw substantial multi‑bagger returns as earnings grew.
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