Overview
Widely considered the greatest investment book ever written, Benjamin Graham's classic teaches the philosophy of value investing. Warren Buffett calls it "by far the best book on investing ever written." Graham provides a framework for investing that emphasizes discipline, patience, and margin of safety.
Graham, Warren Buffett's professor at Columbia, first published The Intelligent Investor in 1949. It is the plain-English companion to his more technical Security Analysis (1934). The 1973 revised edition with commentary by Jason Zweig (added in 2003) is the one most current readers buy; Buffett calls it 'by far the best book on investing ever written.'
Key Ideas
Margin of safety
Always buy at a significant discount to intrinsic value to protect against errors and bad luck.
Mr. Market
The market is an emotional partner who offers to buy or sell every day — take advantage of his mood swings rather than following them.
Investor vs. speculator
An investor analyzes fundamentals and seeks safety; a speculator gambles on price movements.
Diversify and be patient
Spread your investments and resist the urge to trade frequently; time in the market beats timing the market.
Who should read this
Individual investors who want to understand value investing from its source. Also useful for anyone who has noticed that the financial services industry is structured against their interests and wants a clear model for how to invest without a professional advisor. The chapters on Mr Market and the margin of safety are foundational.
Who might skip it
Skip if you want a modern index-fund treatment — Graham was writing before index funds existed, and the book's specific stock-picking methods (net-net, etc.) are harder to apply in today's markets. Skip also if you want short; the book is long and deliberately unhurried.
The verdict
A book worth owning even if you never finish it. Chapters 8 (Mr Market) and 20 (margin of safety) are the ones Buffett tells you to read; they remain the two most important things written about individual investing. The Jason Zweig annotations in the revised edition modernise everything gracefully. Read it once, keep it on the shelf, return to it in every market cycle.
"The investor's chief problem — and even his worst enemy — is likely to be himself."
— Benjamin Graham, The Intelligent Investor
If you liked this
A Random Walk Down Wall Street for the index-fund alternative view. The Little Book of Common Sense Investing by Bogle for the shorter modern classic.