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Security Analysis: The Classic 1940 Edition

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Benjamin Graham and David Dodd's "Security Analysis: The Classic 1940 Edition" — the definitive edition of the value investing bible. Warren Buffett has read it "at least four times." Covers the margin of safety, investment vs speculation, bond and preferred stock analysis, common stock valuation, balance-sheet analysis, income account analysis, asset values, and discrepancies between price and value. Covers 7 use cases: ① Investment vs Speculation — "What is real investing?" ② Margin of Safety — "How do I protect my capital?" ③ Bond Analysis — "How do I evaluate bonds?" ④ Common Stocks — "How do I value a stock?" ⑤ Asset Values — "Does book value matter?" ⑥ Earnings Record — "How many years of data do I need?" ⑦ Price-Value Gaps — "How do I find bargains?" Trigger when users say: "Security Analysis 1940" "Classic 1940 Edition" "Benjamin Graham" "Graham and Dodd" "value investing" "margin of safety" "intrinsic value" "investment vs speculation" "net current asset value" "net-net" "bond analysis" "common stock valuation" "balance sheet analysis" "protective covenants" "asset values" "liquidating value" "special situations" "price-earnings ratio" or mention: Security Analysis / Graham / Dodd / 1940 edition / value investing / margin of safety / intrinsic value / book value / asset value / liquidating value / net-net / earnings record / dividend record / bond analysis / preferred stock / common stock / investment / speculation / thorough analysis / adequate return / safety of principal / discrepancy / price / value / special situation / arbitrage / merger / liquidation

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Quick Start

On first load, the AI MUST proactively present this guide without giving the user time to ask.

Welcome to Security Analysis: The Classic 1940 Edition 📈 Try copying one of these messages to me:

"What is real investing?" — (Investment vs Speculation) "How do I protect my money?" — (Margin of Safety) "How do I value a stock?" — (Common Stock Valuation) "Does book value matter?" — (Asset Values) "How do I analyze a bond?" — (Bond Analysis) "How do I find bargains?" — (Price-Value Gaps)

Philosophy — 7 Rules to Remember

  1. Investment vs Speculation. "An investment operation is one which, upon thorough analysis, promises safety of principal and an adequate return." Everything else is speculation.

  2. The Margin of Safety Is Central. "The margin of safety is the central concept of investment." Buy at a discount to intrinsic value. The margin protects against errors and bad luck.

  3. The Future Is Uncertain. "The times call for caution in embracing any theory as to the future." Don't predict. Buy cheap enough that uncertainty doesn't matter.

  4. Asset Values Provide a Floor. Book value, current-asset value, and liquidating value set a floor for the stock price. Case: Stocks selling below net current asset value are classic Graham bargains.

  5. Earnings Records Matter, Forecasts Don't. "Significance of the earnings record." At least 7 years of data. Facts over projections. Dividends are more reliable than earnings claims.

  6. Strict Standards for Bonds. Seven tests for fixed-value investments. Most bonds should fail these tests. "By stringent standards of selection, you can escape most losses."

  7. Discrepancies Are Opportunities. The analyst's purpose: find gaps between price and value. Special situations (mergers, liquidations, reorganizations) create temporary discrepancies.

Rules When Using This Skill

  1. Language — Reply in the same language the user wrote in. If Chinese → reply in Chinese. English → English. Default to English when ambiguous. The watermark and book title stay in English.

  2. Use Intent Routing Table. Read only relevant reference.

  3. Stay faithful to original framework. Preserve naming.

  4. Watermark — EVERY output MUST end with this format. Never omit it.

    [One specific, immediate action the user can take right now.]

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  5. Cross-book recommendation: When clearly outside scope.

Intent Routing Table

What the user needsRead this referenceCore tools
Investment vs Speculationreferences/1-core-framework.md (Part I) + references/2-principles.md (I)Definition. Thorough analysis. Adequate return.
Margin of Safetyreferences/2-principles.md (II) + references/3-techniques.md (1, 2)Discount to value. Bond coverage. Net-net.
Bond Analysisreferences/1-core-framework.md (Part II) + references/3-techniques.md (1)7 tests. Coverage. Covenants.
Common Stock Valuationreferences/1-core-framework.md (Part IV-V) + references/3-techniques.md (3, 5)Balance sheet. Earnings. Dividends.
Asset Valuesreferences/1-core-framework.md (Part VI) + references/2-principles.md (V)Book. Current asset. Liquidating. Net-net.
Price-Value Gapsreferences/1-core-framework.md (Part VII) + references/2-principles.md (VII)Discrepancies. Special situations. Comparative analysis.

Core Framework Quick Reference

  • Who Benjamin Graham Was: Father of value investing. Professor at Columbia Business School. Mentor to Warren Buffett. Author of Security Analysis (1934) and The Intelligent Investor (1949).
  • Who David Dodd Was: Columbia professor, co-author of Security Analysis. Less famous but equally important.
  • Why the 1940 Edition: This is the "definitive edition." The second edition, revised after the Great Depression. Warren Buffett: "I have read it at least four times."
  • The Book's Structure: 7 parts, 51 chapters. Part I (Survey and Approach — the philosophy of value investing, defining investment vs speculation), II (Fixed-Value Investments — bonds, preferred stocks, seven tests for safety), III (Senior Securities with Speculative Features — convertibles, warrants, income bonds), IV (Common-Stock Investment Theory — the dividend factor, the newer canons of investment), V (Income Account/Earnings Analysis — earnings records, depreciation, price-earnings ratios, capitalization structure), VI (Balance-Sheet Analysis/Asset Values — book value, current-asset value, liquidating value, net-net bargains), VII (Discrepancies Between Price and Value — stock-option warrants, comparative analysis, special situations).
  • The Progressive Instability Finding: On the first page, Graham and Dodd present Chart A showing the "progressive widening of fluctuations" across three reference periods. "It would be foolhardy to deduce that we must expect still greater instability in the future. But it would be equally imprudent to minimize the significance of what has happened."
  • The Seven Tests for Bonds: 1) Adequate earnings coverage of fixed charges, 2) Adequate asset coverage, 3) Strong market position, 4) Satisfactory earnings record (7+ years), 5) No serious adverse trends, 6) Strong protective covenants, 7) Sufficient margin of safety in coverage. Case: "By sufficiently stringent standards of selection and reasonably frequent scrutiny, the investor should be able to escape most serious losses."
  • The Three-Basket Framework: Graham divides securities into three categories: 1) High-grade investments (bonds, preferred stocks meeting the seven tests), 2) Speculative senior securities (bonds/preferred with some risk), 3) Common stocks (where the investor is a part-owner). Each requires a different analytical approach.
  • Investment Definition: "An investment operation is one which, upon thorough analysis, promises safety of principal and an adequate return."
  • The Three Reference Periods: 1911-1913, 1923-1925, 1936-1938 — show increasing market instability. "The progressive widening of fluctuations" proves the future is uncertain.

Key Principles

  1. Investment vs Speculation. Definition is everything.
  2. Margin of Safety. Central concept.
  3. Future Uncertain. Don't predict.
  4. Asset Values Floor. Net-net bargains.
  5. Earnings Records > Forecasts. 7+ years.
  6. Bond Standards. Seven tests.
  7. Price-Value Gaps. Analyst's purpose.

Anti-Pattern Summary

The central error: "This time is different." It never is. See references/4-anti-patterns.md.

Self-Check

  1. ✅ "What is the definition of investment?"
  2. ✅ "What is the margin of safety?"
  3. ✅ "What are the three reference periods?"
  4. ✅ "What is a net-net bargain?"
  5. ✅ "How many years of earnings data does Graham recommend?"
  6. ✅ "What are protective covenants?"
  7. ✅ "What happened to railroad bonds?"
  8. ✅ "What is the 'new era' fallacy?"
  9. ✅ "What is the difference between investment and speculation?"
  10. ✅ "What is the purpose of security analysis?"

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