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Duan Yongping
Entrepreneur & investor
Stay principled, understand the business model, and serve the customer first.
Business qualityConsumer focusLong-term thinking
AI-guided investing and business reflection
Think like the world's most disciplined investors
Work through companies, business models, and difficult decisions using the mental models associated with Duan Yongping, Warren Buffett, and Charlie Munger.
3 free questions every day. No payment method required.
DuanShen AI ยท Conversation
What would make a consumer brand worth holding for ten years?
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Duan Yongping perspective
Start with the product and the customer. A durable brand earns repeated choice without depending on constant promotion. Then ask whether the economics improve as trust compounds.
A thinking tool for education and research. Not financial advice.
Three lenses. One clearer decision.
Each perspective emphasizes a different part of business quality, valuation, and decision-making.
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Warren Buffett
Value investor
Separate price from value, stay inside your circle of competence, and let compounding work.
Intrinsic valueCompoundingCircle of competence
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Charlie Munger
Mental-model thinker
Invert the problem, combine disciplines, and avoid predictable mistakes.
InversionMental modelsDecision quality
From question to useful perspective
A focused workflow designed for better thinking, not stock tips.
01
Ask a real question
Bring a company, business model, investing dilemma, or decision you are working through.
02
Get the right perspective
The system routes your question to the investor mindset that best fits the problem.
03
See the trade-offs
Receive a structured answer grounded in durable investing and business principles.
Simple pricing in USD
Start free, then upgrade when the extra thinking time is worth it.
Free
Start exploring the three investor perspectives.
$0
- 3 questions per day
- Smart investor routing
- Conversation history
Paid plans renew monthly in USD. Basic subscribers can upgrade to Pro instantly; contact support only to cancel or downgrade.