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Trader Profile · The Mid-Century Masters

Benjamin Graham

1894–1976 · Economist, investor & Columbia professor — the 'father of value investing'

He turned investing from guesswork into a discipline — buy a dollar of value for fifty cents, with a margin of safety — and taught the man who would become the world's greatest investor.

Value investingMargin of safetyMr. MarketIntrinsic value
Benjamin Graham portrait
BG
Benjamin Graham, 1950
Public domain · Wikimedia Commons

1 The Story

The professor who made investing a discipline

Born Benjamin Grossbaum in London in 1894, Graham moved to New York as an infant and, after his family lost its wealth, graduated from Columbia University at nineteen. He began his career on Wall Street analysing bonds and in 1926 founded the Graham-Newman investment partnership.1

His books Security Analysis (1934, with David Dodd) and The Intelligent Investor (1949) established the discipline of valuing a security by its underlying fundamentals and buying only with a 'margin of safety.' He also taught at Columbia Business School, where his most famous student was Warren Buffett.1

2 The Big Idea

Price is what you pay; value is what you get

Estimate what a business is worth, then buy well below it.

Graham's leap was to separate price (the quote on the screen) from value (what the business is actually worth). Buy only when price is far below value — that gap is your margin of safety, your cushion against being wrong. It's the line he drew between investing and mere speculation.1

3 The Method

Value, safety, and a moody business partner

Intrinsic value

Estimate what a business is genuinely worth from its fundamentals — earnings, assets, cash — not from the mood of the crowd.

Margin of safety

Only buy well below that value. The discount protects you when your estimate is off or luck runs bad — the heart of the whole method.

Mr. Market

Picture the market as a moody partner who quotes you a price every day. Some days he's euphoric, some despairing. Use his mood to your advantage; never take it as gospel.

Investing vs. speculating

An investment, by Graham's test, promises safety of principal and an adequate return after thorough analysis. Everything else is speculation.

Margin of safety: pay well below value intrinsic value — what it's worth value $100 price paid $60 margin ofsafety
The margin of safety: if a business is worth about $100 and you pay $60, the $40 gap is your cushion against error and bad luck.2

4 Try It Today

Test the idea for yourself

A no-risk exercise

Pick a company you understand. Without looking at the share price, jot a rough sense of what the whole business is worth and why. Then check the price. Is the market offering it well below your estimate (a margin of safety), or paying up? You're practising Graham's core habit: judging value before price.

5 In Their Words

Benjamin Graham, quoted

"An investment operation is one which, upon thorough analysis, promises safety of principal and an adequate return. Operations not meeting these requirements are speculative."
— Benjamin Graham, The Intelligent Investor (1949)2

6 The Books & Their Big Ideas

What they wrote — and what to take from it

The Intelligent Investor

Benjamin Graham · 1949
  • Margin of safety and the Mr. Market parable — the investor's temperament, not just technique.2
  • Investing vs. speculating, defined with a rigor still used today.1

Security Analysis

Graham & David Dodd · 1934
  • The foundation of fundamental analysis — valuing a security from its underlying numbers.1

7 Watch & Read

Go deeper

▶ Curated video embeds here
(e.g. a "value investing explained" lesson — embedded from YouTube, credited)

§ Sources

  1. "Benjamin Graham," Wikipedia — en.wikipedia.org/wiki/Benjamin_Graham
  2. Benjamin Graham, The Intelligent Investor (1949) — the classic statement of value investing and the margin of safety.