Manufactum in December. Munich. That store always gets me. I like writing and they have these writing pads and these Japanese pens, so I ended up in front of a shelf of notebooks that cost more than a good bottle of wine.

I picked one up. I use pads like this for notes I throw away within a week. Plain paper does the same job for a fraction of the price. I buy the expensive one because the price itself is supposed to lend the thought some weight, even though I write almost everything on a laptop and the pad will sit on a shelf. None of that stopped me. I bought it anyway.

On the way to the car I asked myself why. I had no answer. It had felt right in that moment.

That sentence is the whole subject of this essay: it had felt right. The notebook itself had little to do with it. Somewhere upstream, something had shaped the moment to feel that way regardless of what sat on the shelf.

What conversion optimisation actually optimises

I have sold things for more than 15 years and I could do it again tomorrow. Right now I’m a consultant and I sell too. I say this because I am not writing against selling. My problem starts at a specific point: where a system’s success is measured by whether the buyer still recognises their own decision as a decision at all.

Modern sales systems, the AI-generated algorithms behind product recommendations and checkout flows, are built around a term called conversion optimisation. Stripped of the euphemism, this means removing friction, and friction means anything that makes a customer stop and think. In this framing, a pause reads as a drop-off risk, a high-risk process failure that the system is built to engineer away.

I believe it was Amazon that introduced one-click ordering. Whoever did it first, the logic spread everywhere: pre-filled forms, recommendations so precisely matched that no “why this” ever surfaces, checkout flows with every possible exit sanded down. Each of these removes a place where a person might have stopped.

The premise underneath all of it is that a conscious decision is a problem to be solved. For centuries the deliberate choice, weighing an option and being able to say no, has counted as close to the definition of being human. In a modern conversion funnel the same pause is a defect in the pipeline.

This is also why these systems fit so naturally with artificial intelligence more broadly. AI is naturally perfect at switching off human judgment, because we already treat it as smarter and hand it one more decision every day. These systems keep redefining the capacity to pause, check and say no as friction to design out.

The vendors’ pitch cites “decision fatigue”: humans make too many decisions per day and need to be spared some of them. That sounds like care, like the system is saving me time. It’s a fallacy. A conversion system removes my decision because my decision is bad for business, and dresses the removal up as a favour.

The best salesman I ever met

The best salesman I ever dealt with sold me nothing directly. He asked questions, gave me time and told me to go home, think it over and come back if it still made sense. I came back. I bought, and I bought gladly, because my decision had been treated as mine.

That is the distinction that matters, and from the outside two purchases can look identical. A purchase can feel natural because it is right for the buyer, or it can feel just as natural because the friction around it was removed so cleanly that the moment of thinking never arrived. Both end at the same checkout screen, with different histories behind them.

After the flow

The vendors who build these systems call their ideal a “seamless customer journey”, and flow sounds like a compliment. But a river left to itself always runs downhill, along the path of least resistance, and a channel with nothing pushing back only moves the water faster. It removes the buyer’s own authorship of the choice, and leaves an emptiness that shows up later, once the packaging is in the recycling and the notebook is back on the shelf.

To make sure nobody notices that emptiness, the 4-5 star reviews are there to reassure even the last hold-out that everyone else is glad they bought it too.

I still don’t have an answer for why I bought that notebook. I know the store had engineered the moment to keep me from asking the question, and that it worked.