Social Proof
The tendency to think and act as the people around us do, especially under puzzlement or stress. Both good and bad behavior spread contagiously through this channel. One of Charlie Munger’s 25 causes of human misjudgment.
Examples
- Bystander effect: no one helps because no one else is helping
- Market bubbles and panics driven by “everyone is buying/selling”
- Adopting a team norm simply because it is the norm, not because it works
Why It Happens
Copying the group was an efficient survival heuristic — others’ behavior is a cheap proxy for what is safe or correct. Under uncertainty and stress, the brain leans on it even harder.
How to Counteract
- Ask “What’s the evidence?” rather than “What is everyone doing?”
- Notice that stress and confusion are exactly when social proof misleads most
- Deliberately seek the independent judgment of people who aren’t in the crowd