We tend to underestimate how much we're influenced by others

Other people follow trends. I make considered choices that merely happen to match everyone in my peer group. What a lovely arrangement: they get herd instinct and I get taste.

That flattering fiction is why asking “Were you influenced?” produces such useless research. Influence rarely feels like an instruction arriving from outside. It feels like safety, familiarity or a sensible shortlist. The restaurant queue makes the food seem less risky. Customer logos help a software vendor survive the first cut. A presentation format spreads through an industry until everybody independently discovers the same rounded rectangles. Even rebellion comes with reference points: the supposedly unconventional café, trainer or job title still needs a tribe able to recognise the signal.

The useful test removes the autobiography. Change the cues and watch behaviour. Hide the popularity label. Swap the familiar logos. Imagine the restaurant empty and ask whether the menu still carries the same confidence. Put the identical idea in a junior colleague’s mouth and notice whether its brilliance survives the journey. Peers provide legitimate information; ignoring them would be daft. The mistake is granting ourselves immunity while assuming everyone else is a fashion victim. Social influence is most powerful when it has already been renamed “my judgement”. The clever buyer does not deny the crowd. They ask what the crowd has smuggled into the decision.

Behavioural principles

Behavioural ideas at play in this post

Short, plain-English explanations of the principles behind this post, with links to related books and examples in the archive.