What You're Actually Holding

Carolyn Lynch came home from the supermarket in the mid-1970s talking about a pair of pantyhose. They were sold from an egg-shaped plastic display near the checkout, under the name L’eggs, and they were plainly better than the ones you had to make a special trip to a department store to buy. Her husband ran a mutual fund. He worked out that the average woman passed that supermarket checkout every week and wandered into a department store maybe once every six weeks, and that the good hosiery was sitting in the wrong shop. He bought the parent company, Hanes. It became one of the biggest winners of his early career.

The husband was Peter Lynch, and over thirteen years running Fidelity’s Magellan fund he averaged just under 30% a year, which is the kind of number that buys you the right to write books. He wrote two of them, One Up on Wall Street and Beating the Street, and in them he did something most star investors never do: he laid the whole machine bare. The heart of it was a sorting system. Before he asked whether a stock was cheap, he asked what kind of company it was, and he sorted every one into six boxes: slow growers, stalwarts, cyclicals, turnarounds, asset plays, and fast growers.

This is the first of a short run of posts working through those six boxes. Start where Lynch himself started, with his favorite.

A fast grower, in his definition, is a small, aggressive company compounding earnings at 20 to 25% a year. Not revenue. Earnings. He hammered on the difference between growth and expansion, because the two get confused constantly and the confusion is expensive. A company can open stores, buy rivals, and pile up revenue while the earnings that actually compound your money go nowhere, eaten by thinner margins or fresh shares. And it can do the opposite: grow in a dull or even shrinking industry by taking share, trimming costs, and nudging prices. He wanted 20 to 25% rather than 40, because above roughly 30% almost nothing holds the pace for long, and when the inevitable slowdown arrives the market re-rates the stock downward, fast.

Everybody remembers the L’eggs story as a story about discovery: buy what you can see working in your own life. That is the seductive half. It is also the half that has mostly stopped working, and it was never the hard part anyway.

Here is the part that was. Lynch mapped a fast grower onto three phases. A risky startup, still proving the basic idea. A lucrative middle stretch where the company simply copies a proven formula into new markets, one duplicate at a time. And a maturity where it runs out of room and has to find something else to do. The money is made in the middle. The skill, the genuinely difficult and valuable skill, is noticing the day the middle ends. It rarely announces itself. Often the company is still opening outlets and still beating this quarter’s estimate while the older locations quietly stall. Gap did exactly this in the late 1990s: square footage kept climbing, same-store sales did not, and for a while the headline growth hid the rot underneath.

“Every fast grower eventually becomes a slow grower.” It is the least glamorous line in either book and the most important. The trap it warns about is subtle: you can be completely right about the company and still lose, because you are paying a 30-times-earnings price for what is now a 15-times-earnings business, and nobody sent you the memo. And the reason people don’t act on the memo when it does arrive is not analytical. It is emotional. Selling means admitting that the company you fell for is no longer that company, and that is a small grief most investors will pay real money to avoid.

There is a second way to lose here, and Lynch flagged it himself. By late 1972, the fashionable American growth stocks, the “Nifty Fifty” you were supposed to buy and never sell, traded at an average of 42 times earnings, with Polaroid at nearly 95. Then 1973 and 1974 arrived. Polaroid fell about 91%. Coca-Cola fell 69%, McDonald’s 72%, while the broad market dropped around 45.

The businesses were mostly fine. The earnings held up. The prices were the mistake, and it took the better part of a decade for some of them to make investors whole. Lynch’s own escape valve for this was one crude number, the PEG: the price-to-earnings multiple divided by the growth rate. Under 1 is getting interesting, 2 is you’re paying for years of perfection in advance. It is a coarse filter, not a buy button, but it encodes the whole lesson, which is that what you pay caps what you can make even when you’re right about the company. Watch one more thing alongside it: not just the rate of earnings growth but its steadiness. A company compounding at 18% like a metronome is usually a safer thing to own than one lurching to 30% in spikes, because the spikes are the part that snaps.

Two things have shifted since Lynch put the pen down, and honesty requires saying so. A large share of today’s fast growers don’t expand shop by shop at all. A software platform adds its ten-thousandth customer at almost no extra cost, and network effects mean each new user can make the thing more valuable rather than just bigger. His tidy physical life-phase model bends around businesses like that; the middle stretch can last far longer, and end far more abruptly, than a restaurant chain’s ever did. And the supermarket edge that found L’eggs is essentially gone for consumer products, because a hot new app is on every screener and every trading forum within days. It half-returned in a different disguise, though, for anyone willing to actually read subscription growth, churn, and unit economics, which plenty of professional generalists still don’t.

What is striking is that the people who came after Lynch, arriving from opposite directions, mostly end up agreeing with him. The buy-a-great-business-and-never-sell school doesn’t care about store counts; it cares about how much a company earns on the capital it reinvests and how long it can keep doing that. Different lens, same warning against overpaying for growth that won’t last. And the quants who have combed the entire history of the market keep finding that raw, headline growth on its own is not reliably rewarded. What pays is the sustainable, cash-funded, steady kind; the flashy kind is precisely where the wreckage clusters. That is Lynch’s 20-to-25%-you-can-count-on, restated in a spreadsheet. None of them, it should be said, can see the future any better than he could. Neither can I.

So the L’eggs story is true, but it is usually told backwards. Carolyn spotting the eggs at the checkout was the easy, lucky opening. The work was everything after: knowing it was a fast grower, riding the middle phase for all it was worth, and stepping off before it quietly became something slower and more expensive than the thing that was bought. The discovery makes the anecdote. The category, and the day it changes, makes or loses the money.

Nobody rings a bell on that day. That is the whole problem.