Foundations
The Intelligent Investor
Graham's real subject was never stock picking. It was temperament.
Benjamin Graham wrote The Intelligent Investor in 1949 to solve a problem most investing books skip: not how to find a good stock, but how to survive owning one without wrecking yourself in the process.
The formulas in it are mostly outdated. Nobody screens for net-nets the way Graham did in 1949. But the chapter on the investor as his own worst enemy has not aged a day.
The line that matters most
"The investor's chief problem, and even his worst enemy, is likely to be himself." Not the market, not the company, not the economy. You.
That single sentence is where Mr. Market comes from, the moody business partner who shows up daily with a new price, and where the margin of safety comes from, buying with enough room built in that being wrong does not sink you. Both get their own full treatment elsewhere here. Graham's contribution was building both tools for an investor he assumed would panic at exactly the wrong moment, because most of us do.
Investment versus speculation
Graham draws a hard line early: an investment operation is one that, on thorough analysis, promises safety of principal and an adequate return. Everything else is speculation. Not a moral judgment, just a definition, and a useful one. It forces the question of which one you are actually doing before the money moves.
Being businesslike about money is a temperament, not a technique. Graham's own line for it stuck with me: investment is most intelligent when it is most businesslike.
“The investor's chief problem, and even his worst enemy, is likely to be himself.”
“Investment is most intelligent when it is most businesslike.”