By Jason Hreha

Glossary

Bandwagon Effect

Published 2 min read

What is the bandwagon effect?

The bandwagon effect is a shift toward a belief, choice, or behavior because it appears popular. Visible support becomes a reason for further support.

Imagine choosing between two unfamiliar restaurants. One has a line outside; the other is empty. The line may tell you something useful about the food. But if everyone joins it mainly because earlier customers did, the crowd also helps create the popularity you are using as evidence.

How popularity can feed on itself

A popular choice can attract attention, provide reassurance, or make someone feel that joining in is expected. These are different reasons for similar-looking behavior. Using other people’s choices as a guide is often called social proof. Going along to gain acceptance or avoid disapproval is normative social influence. The bandwagon effect names the shift toward an apparently popular option; it does not tell you which reason produced it.

That distinction matters when looking at ratings, polls, or sales. A good product can earn both early and later support because it is good. Popularity followed by more popularity is not enough to show that one caused the other.

A test using online ratings

Muchnik, Aral, and Taylor’s 2013 field experiment tested this problem on a social-news website. The researchers randomly gave newly posted comments an initial up-vote, a down-vote, or no added vote. Random assignment let them compare the influence of the displayed rating without deliberately putting better comments into the positive group.

Comments given an artificial up-vote were more likely to receive a positive vote from the next viewer, and the advantage accumulated in their later ratings. Negative manipulation did not produce a matching downward spiral: other users tended to correct it. The effects also varied by topic. The study shows how a rating can help shape the judgment it appears merely to report.

Is following the crowd always a mistake?

No. Other people may know something you do not, and popularity may be relevant to your goal. Choosing the messaging service your friends use has a practical benefit even if another service has better features.

The useful question is what the crowd’s behavior tells you. Are many people making independent judgments, or are they repeating the same visible signal? Do they want the same thing you do? A restaurant’s long line matters less if its specialty is food you dislike.

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