Herding — Why Smart People Follow the Crowd Off the Cliff

Every financial bubble in history — from tulips to technology to housing — had one thing in common: millions of intelligent, experienced people convinced themselves that following the crowd was the rational thing to do. They were not stupid. They were human. And understanding why herding is so psychologically compelling is the first step to resisting it.

Why This Matters

Herding — the tendency for individuals to align their behaviour with the perceived consensus — is one of the most documented phenomena in economics and psychology. Robert Cialdini identified "social proof" as one of the most powerful principles of influence: when uncertain about the correct course of action, people look to what others are doing and assume it represents the correct response. In most of life, this heuristic is effective. If a crowd is running away from something, it is usually wise to run. In financial markets, it is systematically dangerous. The reason is that market prices incorporate the consensus view by definition. When everyone agrees a stock is excellent, that agreement is reflected in a high price. The consensus view adds no new information because it is already priced in. But the narrative of consensus feels like evidence — and the more people who agree, the more compelling the feeling of certainty becomes.