Habits and Money: Why You Can't Remember What You Spend

I'm Andy Temte and welcome to Money Lessons! Join me every Saturday morning for bite-sized lessons that are designed to improve financial literacy around the world. Today is August 22, 2026.

Last week we looked at decisions — the mental shortcuts your brain takes when money is on the line — and I asked you to put twenty-four hours between a big decision and the money. That assignment has a limit. A great deal of the money that leaves your household this month won't pass through a decision at all. It will leave through machinery that got set up a long time ago and hasn't been looked at since.

That machinery takes three forms: habits, defaults, and friction. Two of them get built by other people, and we'll spend next Saturday on those. Today, we start with the machinery you've built yourself.

A Narrower Definition of Habit

In everyday conversation, we call almost anything a habit. If you do it a lot, you call it a habit. But psychologists mean something narrower and more specific.

To a psychologist, a habit is a behavior you repeat in the same surroundings — the same place, the same time of day, the same order of steps — until you stop consciously deciding to do it and your subconscious takes over.

That last part carries all the weight, so let me say it plainly. Repeat a behavior enough times in the same surroundings and it sinks underneath your conscious thinking. The surroundings begin to start the behavior for you, and your conscious mind is rarely consulted.

Last week we met the two speeds of thinking — the fast, automatic type that runs without any effort, and the slow, deliberate type that does the hard work. A habit is a behavior that has been handed over to subconscious, fast thinking permanently.

And notice what that means. A habit is not simply a behavior you perform often. It's a behavior your surroundings trigger for you.

The Wristwatch Studies

In 2002, three psychologists — Wendy Wood, Jeffrey Quinn, and Deborah Kashy — published a pair of studies in the Journal of Personality and Social Psychology. The design was simple.

They handed college students wristwatches programmed to chime on the hour. At every chime, the student wrote down two things: what they were doing at that moment, and what they were thinking about at that moment.

Two findings came out of it. First, between a third and a half of the behaviors those students recorded were things they did just about every day, usually in the same location. Second — and this is the one that matters for money — while they were performing those repeated behaviors, the students' minds were somewhere else roughly half the time. They were not thinking about what they were doing. They were thinking about something unrelated.

Now, those were college students, tracked over one or two days. I'm not going to stretch that into a claim about every adult, and the researchers were careful on that point themselves.

What Habits Are For

Before we go further, I want to head off an impression that's easy to pick up from all this, because it's wrong and it matters.

Habits are not a defect. They aren't laziness and they aren't weak character. They are a large part of the reason you can function at all.

The same researchers measured this. When their students were doing habitual things, they reported less stress and less of that feeling of being overwhelmed or out of control than when they were doing unfamiliar things. Deliberate, slow thinking is expensive. It tires you out, and you only get so much of it in a day. Every behavior you've turned into a habit is a behavior that no longer taxes your brain.

That's what habits are for. They buy back energy reserves for your attention, so you can spend that attention on something that needs it.

Small Amounts, Repeated

Which brings us to money. A money habit works exactly the way the psychologists describe. The coffee bought on the same walk to work. The app opened at the same red light. The card tapped at the same store, on the same day of the week.

Here's why a money habit deserves your attention, and it has nothing to do with the size of any single purchase.

Small amounts, repeated over and over, add up to large amounts. That is simple arithmetic — not the compounding we studied in the late summer of 2025, where money earns money and those earnings go on to earn more. Nothing is earning anything here. This is plain repetition, and plain repetition by itself is enough to move real money. Watch.

Eight dollars a day, five days a week, comes to a little over two thousand dollars in a year. Keep that up for ten years and you have spent more than twenty thousand dollars — nearly all of it without making a single decision, because after the first few weeks the purchase slipped into your subconscious mind.

So the number worth looking at was never eight dollars. It's eight dollars, spent twenty-six hundred times.

Why Memory Won't Find Them

The sensible next step is to sit down and list your money habits. There's a problem with that, and it comes straight out of the wristwatch studies.

You weren't thinking about those purchases while you made them. That's precisely what made them habits. Which means your memory didn't file them anywhere you can reach. Ask yourself what you bought on autopilot last month and you'll produce two or three obvious ones and miss the rest — not because you're careless, but because there is nothing there to remember.

You can't reliably find a habit by searching your memory. You have to look at a record.

And once you've found one, you'll probably reach for willpower to change it. Back on March 22nd of 2025, I recommended James Clear's book Atomic Habits, and I'll recommend it again here. Clear's central argument is that willpower is the wrong tool for the job. Trying harder doesn't work, because the behavior wasn't coming from your intentions in the first place. It was coming from your surroundings. So change the surroundings. If you want a habit to stick, make the behavior easy — put the thing where you'll trip over it. If you want a habit to stop, make the behavior hard — put a few steps in the way.

What This Means for You

So what does this mean for you?

It means that when you can't explain where your money went, the answer usually isn't a character flaw. It's machinery — running quietly, in the same places, at the same times, without asking your permission.

Here's your assignment for this week, and it's one thing. Pull up last month's statement, either the card you use most or your checking account. Read down the list of merchant names and find the one that shows up four or more times. Say it out loud. Write it down somewhere.

That's the whole assignment. You're not cancelling anything, you're not judging yourself, and you're not adding up what it cost you. You are naming one piece of machinery you've been running.

It may turn out to be something you're glad to be spending money on, and if it is, good — a habit you would choose on purpose is a habit working for you. Or it may be something you'd forgotten you were doing twenty times a month.

Either way, you'll know. And you can't change machinery you haven't resurfaced.

Next Saturday we take on the machinery you didn't build. Why the choice you never make is still a choice. And why a business will work hard to remove every speed bump between you and a purchase, then put those speed bumps right back the moment you try to cancel.

Until next week... Grace. Dignity. Compassion.