📖Benjamin Graham
Simple Portfolio Rules
Stick to well-established, financially strong companies.
The defensive investor should confine his holdings to the shares of important companies with long records of profitable operations and in strong financial condition.
🏠 Everyday Analogy
📖 Core Interpretation
Benjamin Graham advocates a repeatable process: define criteria, execute consistently, and review decisions against evidence. Process quality drives outcome consistency.
💎 Key Insight：Simplicity in portfolio construction reduces errors for most investors.
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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
Dot-com Bubble Restraint (1999)
Tech and internet stocks soared despite little or no earnings. A Graham-inspired investor stuck to valuation metrics, requiring earnings and margin of safety.
✨ Outcome：They sidestepped the 2000–02 crash. While others lost heavily, their conservative portfolio declined less and recovered faster, enabling cheap stock purchases.
2
Pre-Crash Speculation (1929)
An investor buys popular industrial stocks on margin during the late 1920s boom, ignoring earnings and balance-sheet strength, focusing only on rising prices and tips.
✨ Outcome：The 1929 crash wipes out most capital, teaching the danger of leverage, speculation, and neglect of intrinsic value.
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