The wall you should be staring at
Investor Chris Davis, a third-generation fund manager at Davis Advisors, keeps a wall of shame in his office. Not metaphorical. Actual stock certificates, framed, mounted, each one annotated with a plaque at the bottom. The plaques don't say what happened. They say what the transferable lesson was. The goal, Davis explains, is to earn a return on the money that was lost.
One of the certificates on that wall is from a stock where he made six or seven times his money. He framed it anyway because he'd gotten lucky, and he wanted to remember the difference between a good process and a good outcome. Most investors never make that distinction. They look at a winner and reverse-engineer virtue. They look at a loser and assume incompetence. Both conclusions are wrong about half the time, which is exactly the frequency that makes them dangerous.
There's a reason this matters beyond portfolio management. Retail investors flooding into hardware stocks in April, sending screenshots of green candles to group chats, were not processing information. They were celebrating outcomes. The distinction between "I made money" and "I made a good decision" is one most people never bother to draw. I wrote about this in April 2026 Review: Recovery, Extrapolation, and the Posture I Did Not Take, where the temptation to extrapolate a recovery into a thesis was everywhere, and the right move was to sit still.
Davis's wall works because shame is a better teacher than pride. Every investor claims to have a learning process. Almost none of them have made the losses physical, visible, impossible to forget. Journaling is private. A framed certificate on your office wall is public. The difference is the difference between intending to learn and having no choice. Morgan Housel, who spent years writing about investor behavior at The Motley Fool, made a version of this argument in The Psychology of Money: the best financial returns go to those whose relationship with money doesn't depend on never losing any. The wall is not punishment. It's tuition, paid once, displayed permanently.
The man who asked dumb questions on purpose
André Michelin had no idea how tires were made. He knew this, and he treated the ignorance like a tool rather than a liability. When he took over the family's rubber business in Clermont-Ferrand in the 1880s, his first move was to walk the factory floor and talk to workers. Not inspect. Talk. His method, as recounted by David Senra on the Founders podcast, was disarmingly simple: admit total ignorance, then ask how things were done and why they couldn't be done differently. The tone was friendly. The posture was subordinate. The information was invaluable.
Michelin understood something that most executives either forget or never learn. The person who handles material for eight hours a day knows things that the person managing ten problems simultaneously cannot. Hierarchy inverts the flow of information. The higher you climb, the less you know about what's actually happening, unless you build rituals that counteract the distortion.
Harvey Firestone, the tire magnate who built his empire from Akron, Ohio, arrived at a similar conclusion from the sales side. He insisted that every salesman go through a months-long course at the factory. Not to learn selling. To learn tires. A brilliant salesman who doesn't understand the product he's moving is a liability, Firestone wrote in his memoir Men and Rubber. Knowledge had to flow from the factory floor into the field, or the whole chain was hollow.
Retailer Joe Coulombe, who built Trader Joe's into a cult brand, made a parallel discovery about his cheese departments. On-site cheese cutting was a craft. It required knowledge, care, attention. When none of the men wanted to work the cheese shops and the best store captains considered it beneath them, the skill evaporated. Three years after Coulombe left, his successors killed the program entirely. The institutional knowledge walked out with the people who held it, and no amount of process documentation could replace it.
The pattern is consistent across industries and continents and centuries. The person closest to the work holds knowledge that no dashboard captures. Questioning them requires a specific kind of humility that most leaders find intolerable. Michelin didn't find it intolerable. He found it essential.
Your comfort level is lying to you
In 1997, investors were telling their advisors they could stomach a 33% drawdown. Of course they could. Their portfolios had been compounding at absurd rates for half a decade. Losing a third sounded theoretical, like turbulence on a flight you've never taken. Then the drawdown arrived. Nobody was okay with it. Howard Marks, co-founder of Oaktree Capital, has told this story enough times that it should be cliché by now, but it keeps being relevant because people keep making the same mistake. They overestimate, in advance, the equanimity with which they would greet losses. Every single time.
Marks frames investing as a permanent negotiation between two risks: the risk of losing money and the risk of missing opportunity. Most people, when reminded of both, say they want something in the middle. Reasonable. The interesting question is never "should I be balanced?" but "where exactly is the middle today, given what I know and don't know?" And almost nobody answers that question honestly, because answering it honestly requires admitting that your comfort level is a lagging indicator of your last few months of returns, not a stable personality trait.
The person with a hundred thousand dollars doesn't have the margin to be aggressive. The person with ten million might, depending on psychology. But psychology is not fixed. It shifts with markets, with headlines, with the mood at dinner. Marks's advice is deceptively simple: move forward, but with caution. More caution than usual when the outlook is murky and prices are not low enough to compensate for uncertainty. The posture is not defensive. Defensive means cash at one percent. The posture is invested but alert, which is harder than either extreme because it requires daily judgment rather than a single dramatic decision.
The part most financial advice skips. It's easy to tell someone to stay the course. Harder to acknowledge that "the course" looks different depending on whether markets went up or down last week, and that the investor sitting in the chair is not the rational agent they promised to be in the onboarding questionnaire. Comfort is not a fixed input. It's an output of recent experience, and building a portfolio around it is building on sand that shifts with every tide.
My Ledger — notes on investing, books, and things I'm still figuring out. The Library is where I keep the books that shaped how I think. The Journal is where I work through ideas in public.
Mandelbrot — the private toolbox behind the thinking.
Hit reply if something here sparked a thought. I read every response and always write back.
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