The Intelligent Investor

Benjamin Graham · 1949

Thesis

An investor who pays less than a security is worth, buys on analysis rather than on price movements, and treats the market's moods as opportunities rather than instructions can earn satisfactory returns with little risk, while the main danger to most investors is not the market but their own behavior.

The main ideas

Investment means thorough analysis, safety of principal and an adequate return. Anything else is speculation.
Decide which investor you are. The defensive investor wants safety and little effort, the enterprising one is willing to work for better results.
Keep between 25 and 75 percent in stocks, 50 percent by default, and rebalance mechanically.
Mr. Market offers a price every day. Use his moods, never follow them.
The defensive investor should buy only large, stable, long-dividend companies at moderate multiples.
The central concept is the margin of safety: a gap between price and value wide enough to absorb errors and bad luck.

Investment versus speculation

Graham opens with the definition from his earlier Security Analysis: "An investment operation is one which, upon thorough analysis, promises safety of principal and an adequate return. Operations not meeting these requirements are speculative."

Each part of the definition does work. Thorough analysis excludes buying on tips, trends or price movements. Safety of principal means the investor considers what could be lost, not only what could be gained. An adequate return, not a maximum one, means accepting a reasonable result in exchange for safety.

Graham does not condemn speculation outright. He condemns speculation that is mistaken for investment: buying a popular stock at a high price in the belief that it is safe. The mechanism of loss, in his account, is usually not a bad company but a good company bought at too high a price, by someone who thought they were investing.

Implication: before buying anything, ask whether the decision rests on analysis of what you are getting for your money or on expectations about where the price will go. If it is the second, treat it as speculation and size it accordingly.

The defensive and the enterprising investor

Graham divides investors by temperament and effort rather than by wealth. The defensive investor "will place his chief emphasis on the avoidance of serious mistakes or losses. His second aim will be freedom from effort, annoyance, and the need for making frequent decisions." The enterprising investor is defined by "willingness to devote time and care to the selection of securities that are both sound and more attractive than the average."

The book gives each a separate program. The defensive investor follows simple rules: a fixed mix of stocks and bonds, a diversified list of large, sound companies, and no attempt to beat the market. The enterprising investor looks for bargains, special situations and neglected securities, and must be willing to do serious work.

The mechanism is that results follow effort and competence, not ambition. An investor who wants enterprising results without enterprising work ends up with neither the safety of the first approach nor the skill of the second.

Implication: decide honestly how much time and skill you will bring to investing, then follow the program that matches. Choosing the defensive path is a sound decision, not a failure.

The stock and bond mix

For the defensive investor, Graham sets a range: never less than 25 percent or more than 75 percent in common stocks, with the rest in bonds. The default is an even split, which he calls oversimplified but sound. When the market rises enough to push stocks to 55 percent of the portfolio, the investor sells one-eleventh of the stock holdings to restore the balance, and buys stocks when the reverse happens.

Within the stock portion, he recommends dollar-cost averaging, putting the same number of dollars into stocks each month or quarter. He quotes Lucile Tomlinson: "No one has yet discovered any other formula for investing which can be used with so much confidence of ultimate success, regardless of what may happen to security prices, as Dollar Cost Averaging."

The mechanism is that both rules remove judgment from the moments when judgment is worst. Rebalancing forces selling after rises and buying after falls; regular investment buys more shares when prices are low.

Implication: set a target mix in advance and a rule for rebalancing it, and follow the rule especially when it feels wrong.

Mr. Market

Graham's best-known image is in chapter 8: "Imagine that in some private business you own a small share that cost you $1,000. One of your partners, named Mr. Market, is very obliging indeed." Every day Mr. Market names a price at which he will buy your share or sell you his. Some days he is euphoric and names a high price; some days he is despondent and names a low one.

The investor is free to ignore him. A price quoted by an emotional partner says nothing about what the business is worth; it is only an offer. When the offer is foolishly high, the investor can sell to him; when it is foolishly low, buy from him; the rest of the time, the investor can disregard him entirely and judge the holding by the business's own results.

The mechanism Graham describes is that market prices swing far more than business values, because they reflect the moods of buyers and sellers. An investor who takes those swings as information about value will buy at peaks and sell at bottoms.

Implication: treat a falling price on a sound holding as a possible opportunity, not a verdict. Judge your investments by the businesses' results, not by daily quotations.

The defensive investor's stocks

Chapter 14 turns the defensive program into criteria. Graham asks for adequate size, not less than $100 million of annual sales for an industrial company; a strong financial condition, with current assets at least twice current liabilities; no deficit in earnings in the past ten years; uninterrupted dividends for at least 20 years; growth of at least one-third in per-share earnings over the past ten years; a price no more than 15 times average earnings of the past three years; and a price no more than one and a half times book value.

He adds a combined test: the product of the price-earnings multiple and the price-to-book multiple should not exceed 22.5. That allows, for example, a stock at 9 times earnings and 2.5 times book value.

The mechanism is that each criterion screens out a common way to lose money: small and fragile companies, weak balance sheets, erratic earnings, and above all overpaying.

Implication: write down your own criteria before you look at individual stocks, and reject anything that fails them, however good its story sounds.

The margin of safety

The book's last chapter states its central idea: "Confronted with a like challenge to distill the secret of sound investment into three words, we venture the motto, MARGIN OF SAFETY." The margin of safety is the difference between the price paid and the value received. If it is large, the investor can be wrong about the future, or unlucky, and still not lose much.

For the enterprising investor, the clearest case is the bargain issue: a common stock selling for less than the company's net working capital alone, after deducting all prior obligations. Bought at two-thirds of that figure or less, Graham argues, the investor is getting substantially more than his money's worth, because the business itself is thrown in for free.

The postscript adds a humbling note. Graham describes two partners whose single investment in a growing enterprise later produced more profit than everything else they did over 20 years, and asks whether one lucky break and one supremely shrewd decision can be told apart.

Implication: insist on a gap between price and value large enough to survive your own mistakes. When there is no margin, there is no investment.

Limits

Graham himself later abandoned detailed security analysis. In a 1976 interview in the Financial Analysts Journal he said he was no longer an advocate of elaborate techniques for finding superior value, which had paid forty years earlier, and recommended simple criteria applied to a whole portfolio; he also suggested institutions start with the index concept.
The bargains largely disappeared. Charlie Munger has said Graham's method worked by running a Geiger counter over the rubble of the 1930s, and that as the world wised up, it stopped clicking. Henry Oppenheimer's 1984 test of Graham's later simplified criteria found excess returns of about 17 percent a year before they were widely known, falling to about 4.5 percent afterward.
Buffett, Graham's most famous student, moved away from buying mediocre businesses cheaply. In his 1989 letter he wrote that it is far better to buy a wonderful company at a fair price than a fair company at a wonderful price, and credited Munger with the shift.

The Essays of Warren Buffett — Graham's ideas as his student applied and changed them over half a century.
The Interpretation of Financial Statements — Graham's short primer on reading the statements this book's analysis depends on.
Poor Charlie’s Almanack — the argument for quality businesses that moved Buffett beyond Graham.