What Is the Bandwagon Effect? Why We Follow the Crowd

A restaurant has a queue out of the door, and you assume it must be good. A song is everywhere, and you find yourself humming it. A stock is surging and everyone is talking about it, and you feel the tug to buy before it is too late. You did not do any research. You simply saw that other people were doing it.

That pull toward what is popular has a name: the bandwagon effect.

What is the bandwagon effect?

The bandwagon effect is the tendency for people to adopt a belief, opinion or behaviour because many others have already done so. The more people on the bandwagon, the stronger the pull for the next person to jump on. The name comes from the 19th-century practice of politicians using a brightly decorated wagon with a band to draw a crowd, and the phrase “jump on the bandwagon” for joining a popular cause.

The economist Harvey Leibenstein used the term in 1950 to describe consumers wanting a product because others have it, in contrast to the “snob effect,” in which people want things fewer others have.

Why does it work?

Social proof

Psychologist Robert Cialdini calls it social proof: when we are unsure, we look to what others do to decide what is correct. It is a quick, usually reasonable shortcut: if many people choose a restaurant, there is probably a reason.

Conformity pressure

Solomon Asch’s classic experiments showed that people will often agree with an obviously wrong group answer to avoid standing out. The urge to belong, and to avoid being the odd one out, is strong. See what is groupthink.

Fear of missing out

When something seems to be taking off, there is a worry that we will be left behind, which accelerates joining.

Limited information

When we cannot easily judge quality ourselves, such as picking a book, an investment or a candidate, popularity becomes a stand-in for quality.

Mere familiarity

Things we see often start to feel good. See what is the mere-exposure effect.

Believing others know more

We assume the crowd has information we lack, which is sometimes true and sometimes not.

The research

Popularity can be self-fulfilling

In a widely cited experiment, Matthew Salganik, Peter Dodds and Duncan Watts built an artificial music market in which thousands of participants could listen to and download previously unknown songs. Some participants saw how many times each song had been downloaded by others, while others made independent choices. In the social-influence worlds, hits were bigger, more unequal and, importantly, different from world to world: a song that did well in one run might flop in another. Quality still mattered a little, since the very best songs did reasonably well and the very worst poorly, but a lot of the variation came from early random luck being amplified by the crowd.

The lesson is that popularity does not just reveal quality; it can create it.

The wisdom of crowds has conditions

Crowds can be very accurate when people judge independently, and much less so when they copy each other. The bandwagon effect is precisely what turns independent judgements into herding.

Everyday examples

• Products and trends: best-seller labels, “most popular” badges and viral products.
• Politics: voting for a candidate who appears to be winning in the polls.
• Investing: buying assets because prices are rising and everyone is talking about them, which can feed bubbles.
• Social media: liking and sharing content that already has thousands of likes.
• Fashion and fads: adopting a style once it is visible everywhere.
• Workplaces: adopting a method or tool because “everyone is using it.”
• Health and diets: trying the latest trending diet or supplement.

Is it always bad?

No. Following the crowd can be a reasonable shortcut: people who have used a product know things you do not, and conformity can make cooperation easier. The problem arises when:

• everyone is copying everyone else, so the signal contains no independent information,
• the stakes are high and the crowd’s judgement is unchecked,
• you ignore your own needs and values.

How to resist the bandwagon

1. Decide before you look

Write down what you think, or what you would choose, before seeing ratings, polls or other people’s choices.

2. Ask what independent evidence there is

Look for reasons beyond popularity: reviews from verified users, expert evaluation, data and your own criteria.

3. Ask “would I choose this if nobody else knew?”

Imagine a version with no crowd. If your enthusiasm vanishes, it may be the bandwagon speaking.

4. Check who is on the wagon

Are they people like you, with similar needs, or a different audience? What suits them may not suit you.

5. Slow down when the urgency is manufactured

“Everyone is buying,” “limited time” and “going viral” are designed to hurry you. Wait a day.

6. Seek dissenting views

Read a thoughtful critic, or ask someone who chose differently, and why.

7. Use pre-commitment for big decisions

For investments, set rules in advance: how much you will put in, when you will sell. See how to make decisions when you’re unsure.

8. Notice your own influence

Remember that your choices feed the crowd, too. Choose deliberately.

A worked example

Sam sees a new savings app trending on social media, with thousands of positive comments, and is about to sign up and move his savings.

1. Decide before looking: he writes down what he wants, such as low fees, regulation and easy withdrawals.
2. Independent evidence: he checks whether the app is regulated and reads independent reviews.
3. Without the crowd: he asks himself if he would pick it from a plain list of terms. The fees are higher than his bank’s.
4. Who is on the wagon: many comments are from users with different goals.
5. Slow down: he waits a week and finds several complaints about withdrawal delays.
6. Dissent: he finds a critical article.
7. Decision: he keeps his savings where they are and moves only a small test amount.

Common mistakes

• Treating popularity as proof of quality. It is a clue, not a verdict.
• Assuming you are immune. Everyone is influenced.
• Rejecting everything popular. Contrarianism is also a bias.
• Following for fear of missing out. FOMO is a poor adviser for big choices.
• Ignoring your own criteria. What works for the crowd may not work for you.

Frequently asked questions

What is the bandwagon effect in simple terms?

The tendency to do or believe something because many other people do.

What is an example of the bandwagon effect?

Buying a product because it is a best-seller, or backing a political candidate who appears to be winning.

What is the difference between the bandwagon effect and groupthink?

The bandwagon effect is individuals following a popular choice. Groupthink is a group suppressing doubts to maintain harmony and cohesion.

Is the bandwagon effect the same as social proof?

Social proof is the underlying principle that we look to others to guide us, and the bandwagon effect is its snowballing result as more people join.

How can I avoid the bandwagon effect?

Decide before seeing the crowd, check independent evidence, imagine choosing without others, and slow down when pressure to hurry is high.

Does the bandwagon effect affect investing?

Yes. People may buy assets because prices are rising and others are buying, which can contribute to bubbles.

The bottom line

Popularity feels like proof, and sometimes it is. But when everyone is following everyone else, the crowd contains less information than it appears to. Decide before you look, check independent evidence, imagine choosing without an audience and slow down when you feel hurried. Join the wagon on purpose, if you join at all.