📖Warren Buffett

Never Lose Money

🌱 Beginner★★★★★

Capital preservation is the foundation upon which all investment returns are built.

💬

Rule No. 1: Never lose money. Rule No. 2: Never forget Rule No. 1.

— Warren Buffett interview clip (1985): Rule No.1，1985

🏠 Everyday Analogy

Investing is like crossing a river. No matter how much gold lies on the other side, if the bridge collapses and you fall into the river, all the wealth becomes meaningless. Warren Buffett teaches us to first ensure the bridge is sturdy before considering crossing to claim the gold. Preserving your principal is preserving that bridge—only when the bridge remains intact do you have countless opportunities to cross.

📖 Core Interpretation

Preserving capital is the foremost priority in investing. The power of compounding can only be fully realized when losses are avoided.
💎 Key Insight：This isn't about never having a losing trade — it's about never taking a risk that could permanently impair your capital. A 50% loss requires a 100% gain just to break even. Buffett's Rule No. 1 means structuring every investment so the downside is limited, even if it means missing upside. Survival comes first.

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❓ Why It Matters

Mathematical Truth: A 10% loss requires an 11.1% gain to recover, a 50% loss requires a 100% gain, and a 90% loss requires a 900% gain. A single major loss can wipe out years of returns.

🎯 How to Practice

How to put it into practice? 1. Only invest in businesses you understand. 2. Demand a margin of safety. 3. Avoid leverage. 4. Diversify moderately. 5. Focus on downside risk.

🎙️ Master's Voice

Rule No.1: Never lose money. Rule No.2: Never forget rule No.1.
This isn't about avoiding all losses—that's impossible. It's about protecting your capital base. Buffett knows that a 50% loss requires a 100% gain to recover. By focusing on downside protection first, he ensures his capital can compound over decades.

⚔️ Practical Guide

✅ Decision Checklist

  • What is the maximum I could lose on this investment?
  • Can I survive this loss financially and emotionally?
  • Have I protected my downside?
  • Am I taking appropriate risk for potential reward?

📋 Action Steps

  1. Always calculate the downside scenario first
  2. Size positions to survive worst-case outcomes
  3. Demand a margin of safety
  4. Never risk what you can't afford to lose

🚨 Warning Signs

  • Ignoring potential losses
  • Concentrating in speculative investments
  • Risking financial security
  • No analysis of downside scenarios

⚠️ Common Pitfalls

✕Never incurring losses means zero risk - it refers to avoiding permanent capital impairment, as short-term fluctuations do not constitute genuine losses.
✕You should sell any declining stock to cut losses - it is essential to distinguish between a price drop and a decline in value.

📚 Case Studies

1
Berkshire Hathaway's Cash Reserves (2008)
Maintaining hundreds of billions in cash reserves over the long term
✨ Outcome：Better to earn less than to take risks.
2
Dissolution of the Partnership in 1969 (1969)
Unable to find secure investment opportunities
✨ Outcome：Opting for capital return over taking risks

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