The Little Book That Still Beats the Market
Beat the market with one formula
Description
In 2005, a hedge-fund manager named Joel Greenblatt did something that most people who run money for a living would consider close to malpractice: he gave away the recipe. His book, The Little Book That Beats the Market, laid out a single mechanical formula for picking stocks, explained it with sixth-grade arithmetic, and told hundreds of thousands of readers exactly what to buy. No proprietary black box, no subscription, no catch. By 2010 he had revised it into The Little Book That Still Beats the Market, adding fresh data that ran straight through the 2008 crash — the worst stress test a stock-picking method could ask for.
Greenblatt had a reason to be confident. He'd co-founded Gotham Capital in 1985 and run it for a decade at returns that read like a typo — roughly 40 percent a year before fees, by his own account. But the book isn't a memoir of a star investor. It's stranger than that. It argues that an ordinary person, armed with two numbers and the discipline to rank a few hundred companies, can beat most professionals whose entire job is to lose to the market as rarely as possible.
The obvious objection writes itself. If a formula this simple worked, wouldn't everyone use it, and wouldn't that erase the edge the moment the book hit shelves? Greenblatt's answer is the most interesting thing in the whole slim volume, and it has almost nothing to do with math.
The question we’re asking : How can a formula be published, understood, and copied by everyone — and still keep working?What we’ll see : We follow the two numbers behind the magic formula, why bargains and quality rarely sit in the same stock, and the reason the method outlasts the people who read it.
Table of contents
01Chapter 1 — Two numbers, ranked twice
Greenblatt calls it the magic formula, half in jest, because there's nothing occult about it. The whole thing rests on two questions a shopkeeper would recognize. First: is this a good business? Second: is it cheap right now? A good business, in his terms, earns a lot on the money tied up in running it — he measures this as return on capital, roughly how much profit a company squeezes out of the buildings, inventory, and equipment it needs to operate. A high number means the business is genuinely efficient, not just large.
The second question is about price. Here he uses earnings yield — essentially, how much a company earns compared to what it costs to buy the whole thing. A high earnings yield means you're paying little for each dollar of profit. Think of it as the inverse of the price tag: the more you get for your money, the better the yield. Neither number is exotic. Both come straight off financial statements that anyone can pull up for free.
02Chapter 2 — Why cheap and good almost never travel together
The reason the formula works at all is that it goes looking for something the market tries very hard not to offer. A great business trading at a low price is, on its face, a contradiction. Great businesses are supposed to be expensive — everyone can see they're great, so they bid the price up. Cheap businesses are supposed to be mediocre — the low price is the market's verdict. Bargains on quality shouldn't exist. And most of the time they don't.
But sometimes they do, and Greenblatt's explanation is not that the market is stupid. It's that the market is moody. Prices are set by millions of people reacting to news, fear, quarterly disappointments, and the general urge to do something rather than sit still. He borrows Benjamin Graham's old image of Mr. Market, the manic business partner who shows up every day offering to buy your shares or sell you his, at a price that swings with his temper. Some days he's euphoric and overpays. Some days he's despairing and dumps good companies for far less than they're worth. The formula is just a systematic way to trade against his worst moods.
03Chapter 3 — The years the formula tests your stomach
If the formula beats the market so reliably, the question becomes why so few people actually capture those returns. Greenblatt's answer is the emotional core of the book, and it's where he stops sounding like a quant and starts sounding like a coach. The formula does not win every year. It doesn't even win most years cleanly. Over any stretch of a decade, it will spend long, miserable periods lagging the market — sometimes badly, for two or three years running.
That lag is not a flaw the formula needs to fix. It's the price of admission. Greenblatt argues that if the method worked smoothly and predictably, professionals would arbitrage it away in a season. It survives precisely because it periodically hurts. A fund manager who underperforms for three straight years gets fired; clients pull their money at exactly the wrong moment, at the bottom, when the strategy is coiled to rebound. The pain isn't a bug in the system — it's the moat that keeps the system from being competed into oblivion.
04Chapter 4 — What a formula can and can't fix
Step back and Greenblatt's little book is making a claim that runs against the grain of most investing advice, which tends to sell either complexity or convenience. His formula is neither. It's simple enough to fit on an index card and hard enough that almost no one will follow it for a full cycle. The difficulty was never intellectual. He handed the intellectual part away in a couple of chapters of sixth-grade math. The difficulty is entirely behavioral, and no amount of cleverness relocates it.
This is why he can publish the recipe without ruining it. A trading edge that depends on a secret dies the instant the secret leaks. An edge that depends on other people's inability to sit still is renewable. Everyone can know the formula; almost no one can endure it. The years of underperformance act like a toll booth that most travelers refuse to pay, which keeps the road clear for the few who will. Greenblatt is, in a sense, betting on human nature staying exactly as impatient as it has always been.
05Conclusion
Greenblatt gave away his formula twice — once in 2005, once again in 2010 with the crash years folded in and the record still standing. Two numbers, ranked and combined, buy good businesses at bargain prices, and the basket beats the market over time. The arithmetic is settled and public. Nothing about it needs to be trusted on faith; a curious reader can reproduce the whole thing on a rainy afternoon.
