Benjamin Graham

Why he’s here

Benjamin Graham (1894–1976) is the intellectual foundation of nearly everyone in this site’s Trusted tier — Buffett, Munger, and countless others learned from him. We review him as the origin of disciplined, evidence-based investing, the discipline whose absence defines the Avoid tier.

The record and the ideas

• His firm Graham-Newman Corp. returned about 20% a year from 1936 to 1956, well ahead of the market’s ~12%, using rigorous analysis rather than speculation or tips.
• He wrote the field’s founding texts — Security Analysis (1934) with David Dodd and The Intelligent Investor (1949), which Buffett has called “by far the best book about investing ever written.”
• He taught at Columbia Business School, where a young Warren Buffett was his student and later his employee.

Two ideas he gave investors are the antidote to most fraud on this site:

• “Mr. Market” — treat the market as a moody business partner quoting you prices, not as an authority. You decide value; you don’t chase the mood.
• “Margin of safety” — only buy when price is comfortably below your careful estimate of value, so you’re protected when you’re wrong.

Why we rate this 9.5 / 10 — Trusted

• A verifiable long-run record paired with a written, teachable, decades-tested method.
• Radical transparency — his entire philosophy is in print, freely studied for generations. Nothing hidden, nothing to sell.
• A clean record and a career spent teaching the public to think for themselves.

Fair cautions

• Graham died in 1976; markets and disclosure have changed, though the principles endure.
• Be wary of anything sold in his name — the man preached skepticism, homework, and a margin of safety, not products.

Bottom line

The source code of trustworthy investing. Margin of safety, independent thinking, value over hype. Measure any pitch against Graham, and the frauds fall apart on contact.

Analyze like Graham: AI prompt

Graham’s method is the most rules-based, quantitative approach in this site’s Trusted tier — built to be applied mechanically, without emotion. Paste this into any AI assistant with a specific stock in mind:

Act as a defensive value investor following Benjamin Graham's documented method
(Security Analysis, The Intelligent Investor). I will give you a company. Apply this
checklist strictly, using only verifiable financial-statement data:

1. Mr. Market check. State the current price as simply a quote from a moody business
   partner, not as a signal of true value. Do not let the trend or hype affect the
   analysis below.
2. Balance sheet safety. Is debt no greater than working capital / equity in a
   conservative range? Graham avoided highly leveraged companies almost entirely.
3. Earnings stability. Has the company had positive earnings for at least the past 10
   years, with no severe multi-year collapse?
4. Price relative to net asset value. Compare the price to tangible book value and
   estimated liquidation value — is there a discount here, or is the price relying
   entirely on future growth assumptions?
5. Margin of safety. Estimate a conservative intrinsic value using only current,
   verifiable numbers (no rosy growth projections). Is the current price meaningfully
   below that estimate — Graham looked for roughly a third or more below fair value?

Give a verdict: PASSES Graham's defensive criteria, or FAILS, and name the specific
criterion that failed first if it did. This is a mechanical screening framework for my
own research, not financial advice or a guarantee of outcome.

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