The Denominator Trap: Why Your Net Worth Is a Lie

Let me tell you about the best year of my life. On paper.

It was 2021. I opened my brokerage account in January and again in December and the number at the bottom had gone up 31%. Thirty-one percent. I remember the specific feeling — not greed, something quieter and more dangerous. Competence. I felt competent.

Then, in February 2022, I went to buy the thing I had actually been saving for. And the thing cost 44% more than it had the year before.

I had not made 31%. I had lost 13% and paid myself a bonus for it.

That was the day I understood that I had spent my entire adult life measuring my wealth with a ruler that was being shortened, quietly, by people who were not asking my permission. And I had been congratulating myself on the readings.

This edition is about the ruler.

The rule: never measure your wealth in a unit that someone else can print.

It sounds obvious. It is not obvious. Because the trap isn’t that you don’t know inflation exists. Of course you know. The trap is that you know it in the abstract, as a number on the news, while every single instrument you actually use to keep score — your bank app, your brokerage, your net-worth spreadsheet, the mental figure you’d say out loud if a friend asked — is still denominated in the printed thing.

You’ve outsourced your scoreboard to the referee.

Here’s the one thing the financial system genuinely does well: it gives you a number.

The number is clean. It has two decimal places. It is the same unit as your salary, your rent, your groceries, so it feels like the natural way to think. And it goes up over time, which feels like winning.

The number is not a lie because it’s wrong. It’s a lie because it’s a ratio with a hidden denominator.

Every “€500,000 net worth” is actually a fraction:

        500,000
  ─────────────────────
   [what a euro buys]

You obsessively optimize the numerator. You read about stocks, you compare brokers, you argue about the 0.15% expense ratio. And you never look at the denominator, because the denominator isn’t printed anywhere on your screen.

So here’s rule zero, before everything else:

A gain you can only see in one currency is not a gain. It’s a rounding error inside a devaluation.

This isn’t a doom argument. Currency is not going to zero next Tuesday and I’m not going to sell you gold coins. It’s a measurement argument. You cannot manage what you cannot see, and right now, structurally, you cannot see your own denominator.

Same mechanic as the Second-Order Rule, applied to the ruler instead of the invoice. Every measure of “what money is worth” sets off a cascade. Most people stop at the first one. The game is to walk down until you hit something physical — something with a price that can’t be defined away by a committee.

Let’s walk it.

Denominator 1 — Official CPI. The headline number. Reported monthly, tracks a basket, and that basket is chosen. Hedonic adjustment says your phone got better so it counts as cheaper. Substitution says when steak gets expensive you’d buy chicken, so the index buys chicken. Owners’ equivalent rent asks homeowners what they’d hypothetically charge themselves. None of this is a conspiracy — it’s defensible methodology. It’s also a number designed to describe an economy, not to describe your life. This is the denominator everyone uses. Which is exactly why it has no information in it.

Denominator 2 — Your rent, your mortgage, your actual fixed costs. One notch down and already more honest, because nobody hedonically adjusts your landlord. This is real, but it’s still measured in the printed unit, and it’s local. It tells you something. It doesn’t tell you enough.

Denominator 3 — The price of the thing you’re actually saving for. Now we’re getting somewhere. You are not saving for “a basket of consumer goods.” Nobody has ever saved for a basket. You’re saving for a specific thing: the house in the specific street, the tuition at the specific school, the number of years you can stop working. Price your net worth in that, and the picture changes violently. A portfolio up 31% while the house you want is up 44% is a portfolio that went backwards, and no CPI print will ever tell you that.

Denominator 4 — Hard, unprintable units. Grams of gold. Barrels. Square metres of buildable land in a supply-constrained city. Index units. The M2 money supply itself. These are the rulers that cannot be redefined by the entity issuing your currency, and this is where the story gets uncomfortable — because a great many portfolios that look triumphant in nominal terms are flat or negative when you re-price them here. Not slightly. Structurally.

Denominator 5 — Time. The final one. The only denominator that actually matters and the only one that can never be printed. How many months of my life does this pile of money buy back? Every other measure on this list is a proxy for this one.

See the move? Every step down gets you closer to the thing the system hates you measuring: a unit it does not control.

That’s the entire mechanism. It’s the same rule as the industrials — walk down until you hit physical friction — except here, the thing you find at the bottom isn’t a boring monopoly. It’s the truth about whether you actually made any money in the last ten years.

And for most people, run honestly, the answer is: less than they think. Sometimes much less.

Here’s the honest part. I’m giving you the concept for free because it does nothing on its own.

Most people will read the above, feel a jolt of something between insight and dread, and then do one of two things.

They’ll do nothing at all — because the alternative denominators are uncomfortable and the euro number is right there, clean, two decimals, and it went up.

Or they’ll overcorrect, which is worse. They’ll decide the currency is a scam, re-denominate their entire life in one hard asset, and discover they’ve simply swapped one volatile ruler for another — measuring their wealth in a thing that dropped 40% and calling it prudence. Choosing a bad denominator is not an improvement on choosing none. It just moves the lie.

Walking down the cascade is easy. Knowing which denominators to actually run, how to weight them, and what to do when they disagree — that’s the work. It’s the difference between a dashboard that makes you rich and a dashboard that makes you anxious.

The multi-numéraire dashboard. The exact scoreboard I run on the first of every month — five denominators, side by side, one page. What goes in each column, where to get the data free, and how long it takes (it’s under twenty minutes once it’s built). This is the single highest-leverage spreadsheet I own and I’ve never published it.

The 4 filters for a denominator-proof asset. The grid every position has to pass. The pass-through filter (does this thing’s revenue re-price when the currency does, or is it nominally fixed and quietly bleeding?). The unprintable-input filter (does it own something the state cannot manufacture more of?). The jurisdiction filter — the one nobody runs — because an asset that is denominator-proof against your currency and fatally exposed to the currency of the country it operates in is not protection, it’s a costume. And the liquidity-in-crisis filter: it only counts as a hedge if you can actually sell it in the month you need it, at a price that isn’t a punishment.

The 3 positions that pass right now. All three, my entry levels, and precisely which denominator each one defends against — because they are not interchangeable, and holding all three is the point.

The 2 traps in the rule. The fake hedge — the asset everyone calls inflation protection that has, historically and repeatedly, failed to protect against it (I held it for two years; it cost me). And the doom spiral — the failure mode where you measure so honestly that you become paralyzed, refuse to invest at all, and lose more to sitting in cash than you ever would have to being imperfectly invested. I have watched intelligent people destroy a decade this way.

The honest bear case — on the framework itself. The regime in which this entire approach underperforms, badly, and you’d be better off with the naive nominal number. You should know it before you re-architect your finances around this.

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None of the above is investment advice. I’m not your financial advisor. I write about what I do with my own money; you’re responsible for your own decisions and your own research. Past performance tells you nothing about the future. Prices quoted are approximate and current as of the time of writing.

If you take one thing from the free section, take this:

The system is precise about the numerator and silent about the denominator. That silence is not an oversight. It’s the product.

Every institution that touches your money — the bank, the broker, the pension statement, the tax authority — reports to you in the printed unit, and every one of them has an interest in you being pleased with the number. You are the only person in that entire chain with an incentive to check the ruler.

So check it. Once a month. It takes twenty minutes and it will be the most disorienting twenty minutes of your financial year, the first time.

And then it will be the most useful.

Because the moment you can see your denominator, a very strange thing happens: the loud opportunities get quieter and the quiet ones get loud. You stop chasing the asset that’s up 30% nominal and flat in real terms. You start noticing the one that’s flat nominal and up 25% against the ruler that actually matters — the one nobody is talking about, because nobody is measuring it.

That’s the same edge as always. Not being smarter. Being honest one notch earlier than everyone else.

That’s where I hunt.