Why you tip more when the screen asks

The card machine turns to face you with three buttons and a queue behind you. Twenty percent suddenly seems reasonable. Nothing about the coffee changed.

You buy a coffee. The screen swivels round. Fifteen, twenty, twenty-five percent, and a small grey link that says “no tip”. The person who made the coffee is watching. So is the person behind you.

Two years ago you would have dropped a coin in a jar or not. Now you press twenty. The machine did that.

Three things are happening at once. The options are the default, and the default is where most people land. The choice is public, and being seen to choose “no tip” carries a small social cost that a coin jar never did. And the amounts are presented as percentages, which feel smaller than the dollars they represent. A dollar on a five-dollar coffee is a lot; twenty percent sounds modest.

None of this is an accident. The companies that make these systems publish figures showing how much tipping rises when the buttons appear, and the figures are large.

I am not against tipping. I am against not noticing when a choice has been made for me. So here is the small act of independence: decide what you tip for a coffee before you reach the counter. Then, when the screen turns, you are not deciding under pressure with three people watching. You are just confirming.

It sounds trivial. It is also exactly the skill that keeps you from being steered in rooms where the stakes are higher.