📖John Bogle
Business Moat Assessment
Identify sustainable competitive moats before investing.
Before investing, identify the moat — the sustainable competitive advantage that protects the business from competitors. No moat means no long-term edge.
🏠 Everyday Analogy
📖 Core Interpretation
John Bogle emphasizes durable business quality over short-term noise. A strong model, real competitive edge, and disciplined capital allocation matter more than quarterly excitement.
💎 Key Insight：Moats protect earnings from competitive erosion.
AI Deep Analysis
Get personalized insights and practical guidance through AI conversation
❓ Why It Matters
Without business-quality filters, investors drift toward stories rather than economics. Durable cash generation is what supports long-term valuation.
🎯 How to Practice
Use a checklist covering moat, management, unit economics, and capital allocation; track long-term cash generation instead of quarter-to-quarter noise.
⚠️ Common Pitfalls
Buying narratives instead of cash-generating economics
Overreacting to short-term operating noise
Ignoring management quality and capital allocation
📚 Case Studies
1
Bernie Madoff’s Ponzi Scheme (2008)
Bernie Madoff, once a respected market maker and former NASDAQ chairman, ran a decades-long Ponzi scheme promising steady, above-market returns. Already wealthy and influential, he nonetheless kept expanding the fraud, taking in billions from individuals, charities, and institutions. When the 2008 crisis provoked mass redemption requests, the scheme collapsed because there were no real underlying investments.
✨ Outcome：Madoff received a 150-year prison sentence; many investors were financially ruined. His refusal to accept “enough” turned great success into catastrophic criminal failure, illustrating how greed can erase both fortune and legacy.
2
Launch of the First Index Mutual Fund (1976)
In 1976, Jack Bogle’s Vanguard introduced the First Index Investment Trust (later Vanguard 500 Index Fund), tracking the S&P 500. Wall Street ridiculed it as “Bogle’s folly,” since most investors preferred star stock pickers and high-fee active funds.
✨ Outcome：Over decades, the simple S&P 500 index beat the majority of active U.S. stock funds after costs. The fund’s success demonstrated that owning the whole market cheaply usually outperforms trying to pick the winning stocks or managers—the core of “buy the haystack.”
See how masters handle real scenarios?
30 real investment dilemmas answered by legendary investors
Explore Scenarios →