It is tempting to call this irrational. It is more useful to ask what it is for. A pattern this consistent is not a character flaw. It is a design feature, and design features can be worked with. We describe the departure from the model as an error. We might equally describe the model as a hopeful guess about us. In the studies we have, the effect is modest, reliable and almost entirely ignored by the people it describes.
Why it persists
Nobody sets out to be governed by small talk, yet it shapes an astonishing share of the ordinary day. The mind that evolved for small groups and immediate dangers is now asked to manage a pension. It does its best. None of this is new. Adam Smith noticed most of it, and then the profession spent two centuries forgetting. Ask most people why they did what they did and they will give you a reason; ask them again a week later and the reason will have quietly changed.
The point is not that people are foolish. The point is that habit is expensive, and we economise on it like everything else. Notice how rarely anyone is argued out of small talk, and how often they are simply moved past it by a change in circumstance. The measure that matters is not what people say about habit but what they do when nobody is scoring. What looks like habit from the outside is usually something simpler from the inside: tiredness, a deadline, a wish not to look foolish.
