The number came from the machine, and it was wrong — not because the math was off, but because it was only math.

It was a weekday last year, a little after one o'clock, and I was at the same desk I'm writing this from, on a lunch break from the day job, which I was doing from home that season. The coffee was the after-lunch one, the cup that means the afternoon is about to start. On the screen was an investing plan I'd been building for weeks with an AI assistant I had only just discovered — the system that would eventually become the thing you're reading, though it didn't have a name yet and wasn't a business, just a plan to carry me through a transformation I could see coming the way you can see weather coming over a flat field.

We'd gotten to the part where the plan needed a monthly number. The assistant had produced one on its own, a few conversations earlier, from the budget figures I'd given it — a sensible number, the kind a spreadsheet arrives at when it's asked what you can afford. And I sat there with my coffee and did something the spreadsheet couldn't do. I pictured the brokerage screen.

I imagined it the way it would actually look: a new position of the spreadsheet's size arriving each month, the amount sitting next to the company's name in the account, a row I'd see every time I logged in for the rest of the decade. And at that number, the rows looked — fine. Affordable. Reasonable. Like something I could do without thinking about it.

That was the problem. I didn't want to do it without thinking about it.

So I pictured the screen again with the next clean figure up in the row — one notch past the machine's answer, the kind of number that reads like ownership rather than a contribution. And something changed in the picture. At the higher number the row looked like a stake in something. It looked like I'd bought a piece of a company, not fed a plan. I can't fully defend that feeling with arithmetic, and I've stopped trying. The higher number felt real. The machine's number felt like a subscription.

Then I did the thing you're supposed to do, and ran the budget again with the higher number in it. It cleared. On paper I could afford it every month, in the good months and the ordinary ones. But I also knew, sitting there, exactly what it would feel like on the day the money moved: it would sting a little. Not enough to hurt. Enough to notice.

And that's when the decision made itself, because I realized the sting was the point.

Here's the principle I backed into over that cup of coffee, and have held to on every anchor day since. An amount that is small enough not to sting is an amount that is short-changing your future self. If the transfer is invisible, it isn't a commitment; it's rounding error. The reason a monthly schedule works at all is that it makes you feel the decision once, on the day, instead of relitigating it every day in between — and a number you can't feel can't do that job. The sting is the receipt. It's how you know the plan is real. But read the word carefully: a sting, not a wound. An amount that threatens the rent, or raids the emergency fund, isn't a deeper commitment — it's a plan designed to be abandoned, and abandonment is the only truly wrong size. Big enough to feel. Never big enough to fear. The sting is a receipt, not a penance.

There's an old piece of American banking history that gets at this better than I can. In 1909 a trust company in Pennsylvania started something called the Christmas Club: customers deposited a fixed amount every week, all year, into an account that paid no interest and couldn't be touched until December. No interest. People lined up for it anyway — by the 1920s there were millions of members and the banks could barely keep up. The economists of the day were baffled: why would anyone lock money away for nothing? The members weren't baffled at all. They knew they wouldn't save the money on their own, and they knew that a weekly deposit small enough to forget would get forgotten. The club worked because the deposit was felt, every week, in the envelope. The structure was the product. The interest was beside the point.

That's the whole sizing question, and it has two parts that sit in tension. The first is the ceiling: the number has to clear in a bad month without negotiation, because an anchor you have to skip once is an anchor you'll skip twice. The second is the floor: it has to be large enough to sting, because an anchor you can't feel won't build the person the plan is for. Most people only run the first calculation. The spreadsheet only runs the first calculation. The second one you have to run with your eyes closed, picturing the screen.

A few things I'd gotten wrong before that lunch break, in case you're carrying them too.

The number is not a prediction. It is not sized to what the companies will do or what the decade will deliver; it is sized to you — to what you can clear and what you can feel — and it would be the same number in a boom or a bust. That's deliberate. The one input the plan is allowed to depend on is the one you control.

The number is not permanent in the sense of forever, but it is permanent in the sense that matters: it doesn't change on a good month or a bad one, on a headline or a hunch. If it ever changes, it changes on a calm day, for a reason that would still be true a year later — a raise, a new mortgage, a child — and it changes once. I set mine about two months before the first anchor was placed, before any of this was a business, and it has not moved. The urge to move it has arrived several times. It arrives in two costumes: "you can afford more this month," and "it's a bad month, skip one." Both are the same voice, and the schedule exists so that it never gets a vote.

And the number is not the plan. It's the plan's heartbeat. The companies, the layers, the no-sell rule, the calm day on which the seats were chosen — those are the plan. The amount is just how the plan stays alive from one month to the next, and it only has to do one thing well: be the size that makes the heartbeat perceptible without ever stopping it.

I still sit at this desk. The coffee is still the after-lunch one. The row I pictured that day now exists, many times over, and it looks the way I imagined it would — like a stake, not a subscription — and on anchor day it still stings a little, which I've come to think of as the sound of the plan clearing its throat.

If you're sitting with your own number right now, running the budget for the third time, here's what I'd say with a hand on your shoulder. The spreadsheet has already told you the ceiling. You already know it. What it can't tell you is where the floor is, and the floor is the thing that will decide whether you're still doing this in ten years. So close the laptop for a minute, picture the screen, and find the number that would make you feel like you bought something. Then check that it clears in a bad month. If it does both, that's your number. It will sting a little. That's how you'll know.

— Christopher

P.S. — The anchor I set that afternoon is placed in public every month, with the reasoning, in the Monthly Anchor. The sting is documented there too. My number belongs to my life. Yours will come from yours.

Nothing in this publication constitutes financial, investment, tax, or legal advice. AI Wealth Blueprint is an educational newsletter published for informational purposes only under the "publisher's exemption" of the Investment Advisers Act of 1940. No personalized investment advice is provided. All examples, illustrations, and numeric scenarios are hypothetical and for educational purposes only. Past performance does not guarantee future results.