The Observation

There is a story about the philosopher Denis Diderot that I think about more often than almost any other piece of intellectual history.

In 1769, a friend gave him an expensive scarlet dressing gown. It was beautiful. It was also, Diderot soon realized, completely out of place in his study. Next to the new robe, his old desk looked shabby. His chair looked worn. His prints looked cheap. One by one, he replaced them — a leather chair, an expensive writing desk, finer artwork — until, within the year, he had spent himself into debt refurnishing a room that had suited him perfectly well before the gift arrived.

He wrote an essay about it afterward, with the kind of clarity that only comes from watching yourself make a mistake in real time. I was the absolute master of my old robe, he said. I have become the slave of the new one.

I first read that line in my twenties and filed it away as an amusing anecdote about consumerism. It took me another decade to understand that Diderot had not described a flaw in his character. He had described a mechanism — one that runs quietly through almost every life, mine included, and one that only becomes visible once you start asking a very specific question of your own decisions.

The Question Behind Every Decision

The question is this: does this thing pay me, or does it bill me?

In accounting, the distinction is old and precise. An asset produces value without continuous input. A liability, or an expense, consumes value and requires continuous feeding just to stay where it is. Most people apply this test exclusively to money — to a portfolio, a mortgage, a savings account. Almost nobody applies it to the rest of their life, where it matters just as much.

Time behaves like money. So does attention. Both can be invested, and both can be spent in ways that quietly bill you for years without ever appearing on a statement.

Once I started applying the asset-or-expense question outside of finance, ordinary decisions started looking different. Not wrong, necessarily — just differently shaped than I had assumed.

A Concrete Case: The Gym

Take a decision that seems almost too small to analyze this carefully: whether to join a commercial gym or build a simple setup at home.

The membership looks inexpensive at the door. Perhaps fifty dollars to join, fifty dollars a month after that. Run the real cost over five years, though, and the picture changes. Add the annual renewal fee, and you are close to thirty-four hundred dollars before you have accounted for a single minute spent driving there and back. At three sessions a week, that commute alone consumes somewhere around three hundred and seventy hours over five years — nine full work weeks, spent entirely in transit to a piece of equipment you do not own. And most of that membership, statistically, goes unused. The industry's economics depend on it.

A home setup inverts the shape of the cost entirely. The upfront outlay is real — a power rack, a barbell, plates, somewhere between one and three thousand dollars depending on ambition. But after twelve to twenty-four months, the marginal cost of a workout falls to zero. No commute. No queue for the equipment. No bill arriving every month regardless of whether you showed up. The rack still has resale value years later if your circumstances change. One structure is an operating expense: it buys convenience but demands endless refeeding. The other is capital expenditure: expensive at first, then nearly free, forever.

There is, though, a level above even the home rack. It is bodyweight training — yoga, Pilates, calisthenics — and it removes the asset itself from the equation. No rack, no plates, nothing to move house with, nothing that ties you to one room or one country. You can practice it in a hotel room, a park, an airport lounge. Building real strength this way is harder than loading a barbell; the technique takes longer to learn, and progress is less obvious in the beginning. But once the movement patterns are in the body rather than in the equipment, they are portable for life. A set of resistance bands — cheap, weightless, foldable into a drawer — can carry most of what you need beyond that. This is the version of the asset that has no maintenance cost at all, because you have become the asset.

The Trap Diderot Named Before Economics Did

This is where his robe becomes useful again. Diderot did not overspend because he lacked discipline. He overspent because a single high-quality object exposed everything around it as inadequate by comparison, and the desire to restore coherence pulled him, purchase by purchase, into an entirely new standard of living he had never actually decided to adopt.

This still happens, constantly, and it rarely announces itself as overspending. It arrives disguised as taste. A good desk makes the chair beside it look wrong. A renovated kitchen makes the rest of the house feel unfinished. Retailers and recommendation algorithms have gotten remarkably good at accelerating this exact instinct, presenting entire coordinated lifestyles rather than single products, precisely because a coordinated lifestyle sells far more than one object ever could.

The asset-or-expense question is the cleanest defense against it. A single purchase that quietly requires four more to feel complete was never a single purchase. It was the entry fee to a recurring one.

The Currency Nobody Audits

The least visible column on this ledger is not time or money. It is attention — the plain capacity to think clearly, which drains over the course of an ordinary day whether you notice it or not.

Every decision, however small, draws on the same limited reserve. What to wear. What to eat. Which email deserves a real answer. By late afternoon, that reserve is measurably smaller, and the mind starts reaching for shortcuts: the easy option, the deferred decision, the habitual choice made on autopilot rather than on purpose. This is why a sharp negotiator at ten in the morning can make a genuinely poor decision by evening. The market did not change. The available thinking did.

Physical clutter runs the same tax quietly in the background. An unfinished task, an unopened drawer of things you meant to sort — each one sits in the periphery of attention, issuing a small, unresolved demand. None of it is urgent. All of it, together, is expensive.

I have come to think of a clear desk and an empty inbox less as tidiness and more as balance sheet maintenance. They are not virtues. They are the removal of a recurring charge.

Vedlen Observation

Money is the currency everyone learns to track, and the one you can most easily replace.

Time and attention are the two nobody teaches you to audit, and the only two you cannot.

A ledger that accounts for one and ignores the other two is not simplified. It is wrong.

The Asset Test

Before the next purchase, subscription, or commitment: will this still be paying me in five years, or will I still be paying it?

What I Am Currently Doing

I have been going through everything in my life, one item and one subscription at a time, and asking the same three questions: do I actually use this, does it cost me money to keep, and does it demand my time or attention in return. Where the answer reveals something I no longer need but which keeps quietly billing me, I remove it — and where possible, I sell it rather than let it sit, and put whatever it returns back to work. What stays is only what earns its place: things that ask nothing further of my time, money, or attention, and ideally things that give some of it back.

A small example. I recently bought a robotic vacuum. It was a real cost upfront, but I researched it carefully first — cheap to maintain, rarely breaks, and the parts that do wear out are inexpensive and easy to replace myself. It now saves me roughly forty-five minutes, three times a week. That is a little over two hours of my week returned to me, permanently, for the cost of one decision made carefully rather than quickly.

Compound Selection — A Paper Notebook

Get a small paper notebook and use it for exactly one purpose: every time something in your life proves genuinely useful, write it down — what it was, and what it actually gave you. And every time something turns out not to be useful — something that drags on too long, something that costs more than it is worth, something that quietly irritates you — write that down too.

Once a month, read back through the entries. A pattern usually appears faster than expected. If the same complaint keeps resurfacing — unused, irritating, dragging on, overpriced — that is a clear signal to cancel the subscription, sell the object, or change the behavior. If something keeps proving its worth, ask the opposite question: is this the best version available, or would a real upgrade change the result meaningfully rather than just cosmetically.

The notebook itself is almost worthless. What it produces, read back a year later, is not.

Closing Thought

Most people spend their entire lives managing the column they can see.

The one that quietly decides everything else is the one they were never taught to open.

See you next Tuesday.