The Bandwagon Effect and Why People Follow the Crowd

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What is the Bandwagon Effect?

The bandwagon effect is a psychological tendency where the adoption of ideas, products or behaviour increases with the uptake (or perceived uptake) by others. This means the propensity of people taking up the phenomenon rises as more people decide or appear to follow the trend (i.e. jump on the bandwagon). The bandwagon effect is part of a group of cognitive biases or logical errors. They enable the human brain to make decisions more quickly. However, cognitive biases can result in people making mistakes and suboptimal decisions.

1. Examples of the bandwagon effect include:


  • Songs and groups become more popular as more people follow and listen to them. Sometimes a particular sound or style becomes popular as the “next big thing” and artists who are associated with the trend will benefit.



  • Similar to pop music, published charts of sales of individual games can have a huge impact on the popularity of games. In July 2016, Pokemon Go, a new smartphone app incorporating virtual reality become a global phenomena. As the app was released in one country or region at time it also benefited from the scarcity heuristic.
Screen for capture of Pokemon Horsea
Source: Pokemon Go iOS app


  • Where drinks become part of the fashion of socialising, such as vodka. Brands can benefit from the bandwagon effect when popularity is all that counts.

Stock Market Bubbles

  • Stock market and asset bubbles occur when people stop using their own judgement and rely on the wisdom of the crowd. People wrongly assume that other investors must have knowledge they don’t. They seek to avoid regret (which they might feel if they don’t follow the crowd).


  • Sales of clothes, shoes and other fashion items are highly responsive to their popularity. People love to buy clothes that are the latest style to demonstrate that they are keeping up with the latest trends.

2. What causes the bandwagon effect?

The bandwagon effect demonstrates the importance of social influence and implicit motivations on human behaviour. This includes the power of social-norms, customs, traditions, and a desire to conform and belong to groups that are integral to our social networks. Some of the factors that contribute to the bandwagon effect include:

Herd Instinct: 

As social creatures our herd instinct is a strong motivator

When people consciously or unconsciously copy the behaviour of the majority of people, this is referred to as our herd instinct. For example, people may purchase a brand due to its popularity within their peer group. Not because they compared the features and consider it to be the best product. Why spend time evaluating all the options when you can copy the choices made by others you trust?

Our herd instinct is an important driver of the bandwagon effect as it is an automatic impulse or tendency to act in a group. Customs, traditions, expectations, social status, roles and a wish to be liked can all result in a desire to conform to group behaviour.

Loss Aversion: 

People that are loss averse, are more concerned about a loss than a gain of the same size. This is partly because of the fear of missing out. Regret is a powerful and deeply unpleasant emotion. When everyone else appears to be doing something we can become anxious that we are missing out on something valuable. Our loss aversion motivates us to join in.


The bandwagon effect is a form of groupthink, where the pressure to conform and support the in-group is very strong. Following a trend or fad is also seen as supportive to the group decision. It can be used to dismiss anyone who questions it.

A Need to Belong: 

People are “super social apes” as marketing expert Mark Earls points on his book Herd. We have a strong desire to belong to groups of people we admire or want to be associated with. We also don’t want to be the odd one out or to be excluded from our social networks because we don’t conform to social norms, customs or traditions.

People like to be Right: 

Some psychologists believe that the bandwagon effect may be an evolutionary strategy for reducing the risk of making a poor decision. Being part of a large crowd can certainly provide protection in dangerous environments. Merchants also risk losing reputational capital if they sell sub-standard goods or services to a member of a large group. People understand this and so assume that they are less likely to be ripped-off if they buy from a well-known supplier who is known to other members of their social network.

Using our social network to identify what everyone else appears to be choosing seems a good short-cut to make the right decision. We assume other people may know something we don’t and that ‘everyone else can’t be wrong’.

3. The Downside to the Bandwagon Effect:

The bandwagon effect can be relatively harmless when it influences what music we listen to, the clothes we wear, the colours we use to decorate our house and the gadgets we buy. Often the ‘wisdom of the crowd’ can help us make relatively good decisions. However, it can be dangerous if we completely suspend judgement in areas like investments, health, politics and business.

  • In the UK many people were influenced by misleading and incorrect information about how leaving the EU would allow the country to ‘take back control’ of sovereignty and allow the government to give an extra £350m a week to the NHS. Voters were told they could keep the same benefits of EU membership without having to pay for it. People in the UK now face losing rights guaranteed under freedom of movement, increased barriers to trade with their closest and most important trading partner, and years of difficult negotiations with the EU. None of the benefits they were told would come from leaving the EU have so far materialised.

Boris Johnson Brexit bus lie

Source: CityA.M.

Misleading research from the anti-vaccination movement has resulted in a significant fall in the proportion of parents getting their children immunized against dangerous childhood diseases. In the UK, the decline in the proportion of children being vaccinated with the MMR (measles, mumps and rubella) vaccine contributed to the World Health Organisation. Thus withdrawing the UK’s measles free status after it had 231 cases in the first quarter of 2019.

Stock Markets and the Pandemic

  • Stock market crashes are very damaging to most people even if they don’t directly hold any shares. A crash can damage confidence in the economy and create uncertainty which may delay or stop investment and recruitment. Most stock market crashes are caused by asset bubbles resulting from investors suspending judgement and following the crowd. In these circumstances the bandwagon effect can be very damaging to the health and security of millions of workers who rely on the value of stocks and shares for their pension or as a savings vehicle.
  • During the Coronavirus pandemic of 2020, a conspiracy theory emerged which blamed the roll-out of the 5G telecommunications technology for the spread of the virus. It was claimed that 5G degrades the immune system and the risks were being covered up by the global telecommunications industry. As the theory spread mobile phone masts were set alight across European countries and telecommunication engineers were abused. This threatened important communication networks during a global health crisis. Scientists pointed out that COVID-19 is spread through respiratory droplets and you cannot transmit droplets through 5G waves. Furthermore, a number of countries hardest hit by COVID-19 have no 5G masts (e.g. Iran).

4. Does The Bandwagon Effect Support Influencer Marketing?

The bandwagon effect doesn’t appear to involve specific ‘influencers’ as part of the way it works. Indeed, Mark Earls points out that there are a number of styles of decision making. Not all decisions are primarily directed by social influence.

Even when social influence is important it is often undirected, so the role of “influencers” is less clear or manageable. The evidence suggests that ideas and behaviour do not spread through influencers, but rather through our large and complex social networks.

5. The bandwagon effect & conversion optimisation:

Developing a compelling purpose-led value proposition and encouraging people to interact with other people about your brand are important first steps in improving conversions. It is not what you say about your brand that matters, it’s what your customers and staff say that determines what your brand stands for.

Define a clear brand purpose and align your businesses and employee behaviour with what is important to your customers. If you can do this you are more likely to motivate visitors to interact and share your brand with others.

Image of Lean Cuisine ad "#Weigh this" which benefited from the bandwagon effect

Lean Cuisine manufactures low fat food for people who want to be careful about their calorie intake. Rather than focusing on the obvious weight control benefit of their brand they recognised that people do not necessarily buy their product because they want to lose weight.

A strong implicit motivation to purchase Lean Cuisine is that customers want to feel good about themselves for being careful about what they eat. To reflect this core brand purpose they created an ad “#WeighThis” which shows people talking about what they are most proud of in life. The YouTube ad went viral because it communicated this core purpose in such an emotional and inspiring way.

Celebrity Endorsement

Image of cristiano ronaldo playing poker
Image Source:

Evidence of social proof can help online conversion optimisation. This includes customer testimonials, celebrity testimonials, number of customers, product rating and reviews, social media likes and shares, awards and brand logos of well-known customers or partners. Indeed, a lack of social proof is often a key reason for poor online conversion rates. Visitors are reassured when they perceive that a site is popular and trusted by lots of customers.

Social Proof A/B Test

Example of A/B testing customer numbers for social proof
Source: Cheeky Bingo

In the above A/B test example, the only difference between the two variants is the number of monthly players from all players on the left (i.e. total number of players for all rooms throughout the whole month) to the number of unique players (i.e. only counting each player once in a month) on the right. This dramatically reduced the number of active players that could be quoted underneath the call to action button. Variant B displays the lower number of unique monthly players reduced registration conversion on the landing page by 5%.


The bandwagon effect demonstrates that social influence is one of the most important drivers of behaviour. However, influencer marketing is only one aspect of this. People copy behaviour for a number of reasons and in a number of different ways. Not all decisions are strongly shaped by social influence and so other marketing strategies may be better suited to your market.

It is essential to establish a strong and compelling value proposition. People love to associate themselves with people and brands that epitomise their own values and behaviour. A purpose-led proposition can help this process and can encourage customers to interact with your brand. This can facilitate the sharing of your idea or product through social networks.

Having clear evidence of social proof on your site or app should also be a priority. It provides reassurance to visitors that you are a popular and trusted brand. Use online experiments to validate the implementation of social proof as it is particularly sensitive to how and where it is communicated.

Avoid simply copying trends and fads in website design as these are often not based upon evidence or experimentation. This form of the bandwagon effect has resulted in designers using the hamburger icon and using auto-play which have proven to only harm conversions. Before implementing new ideas on your website try to test the impact first with an A/B test.

Related posts:


Word of Mouth

Herd instinct