The Psychology of Overconfidence: Why Self-Belief Can Lead to Success

Discover why people tend to be overconfident, how self-belief may have evolved, and what psychology research reveals about confidence, risk-taking and success.

Why Are People So Confident in Their Abilities?

Confidence is usually considered a positive quality. It can encourage people to pursue ambitious goals, start businesses, take on leadership roles and compete when others might hesitate.

But confidence can also go too far.

Many people believe they are better than average at driving, intelligence, communication or other everyday skills. Statistically, everyone cannot be above average. This widespread tendency raises an interesting question: if overconfidence can lead to poor decisions, financial losses and unnecessary risks, why has it remained such a common feature of human behaviour?

New research offers an intriguing explanation. Rather than viewing excessive confidence purely as a psychological mistake, researchers suggest that self-belief may also function as a social signal.

In other words, confidence may sometimes communicate something about a person's underlying ability.

Overconfidence May Have an Evolutionary Advantage

One influential explanation for human self-deception comes from evolutionary biology.

The basic idea is that people who genuinely believe in their own abilities may appear more convincing to others. Someone who is nervous, hesitant or visibly uncertain can unintentionally reveal that they do not fully believe what they are saying.

By contrast, genuine self-belief can make communication appear more persuasive.

However, researchers Chris Dawson and David de Meza argue that this explanation does not tell the whole story. If everyone simply becomes more confident, why would confidence remain a useful signal?

Their theory draws on the biological concept known as the handicap principle.

A famous example is the peacock's elaborate tail. The tail requires resources to develop and can make the bird less agile. Because maintaining such a costly feature is easier for a healthy, capable bird, the display can provide information about the animal's condition.

The researchers suggest that extreme self-belief can operate in a somewhat similar way.

Confidence Can Be Costly

Imagine two drivers.

One is an inexperienced beginner who believes they are an exceptional driver. The consequences of that confidence could be serious because their actual ability is not strong enough to support their belief.

The second driver is highly skilled but equally confident. Their strong self-belief is less likely to produce disastrous consequences because they possess the ability to back it up.

This creates an interesting relationship between confidence and competence.

For capable people, confidence can provide significant advantages while carrying relatively manageable costs. Confidence may encourage them to apply for opportunities, negotiate, compete, launch projects or take calculated risks.

For less capable people, the same level of confidence may produce much greater consequences.

This difference can make confidence a potentially informative signal of ability, even when confidence itself is not perfectly accurate.

The Dunning-Kruger Effect May Be More Complicated Than We Think

The discussion of overconfidence often leads to the Dunning-Kruger effect, a concept introduced by psychologists David Dunning and Justin Kruger.

Their influential research suggested that people with lower levels of competence can sometimes be particularly poor at recognising their own mistakes. In simple terms, someone may lack both the skills needed to perform well and the knowledge required to recognise their weaknesses.

This idea became widely popular as the phrase "unskilled and unaware of it."

However, interpreting these findings is more complicated than the popular version suggests.

One important statistical issue involves randomness. When people are divided according to their actual test results, individuals who perform poorly may have been affected by bad luck as well as ability. Their predictions about their performance cannot perfectly account for random factors.

Researchers can approach the problem differently by grouping participants according to their expectations rather than their eventual test scores.

According to the research discussed by Dawson and de Meza, people with higher expectations also tended to perform better while displaying greater overconfidence overall.

This interpretation challenges the simplistic idea that the most confident people are necessarily the least competent.

Why Confidence Can Help People Take Opportunities

Self-belief can have practical benefits.

A person who believes they can succeed may be more willing to enter a competitive environment. They might apply for a demanding job, pitch an idea, start a company or pursue a difficult personal goal.

Someone who accurately recognises every possible obstacle may sometimes become so cautious that they never take action.

This creates an important distinction between confidence and accuracy.

Confidence does not guarantee success. However, a certain level of confidence can influence whether a person gets the opportunity to demonstrate their abilities in the first place.

That may help explain why excessive confidence can persist even when it occasionally produces spectacular mistakes.

The Role of Loss Aversion

Another psychological trait complicates the picture: loss aversion.

People often react more strongly to losses than to equivalent gains. Losing a certain amount of money can feel more painful than gaining the same amount feels rewarding.

This can encourage cautious behaviour.

At first, loss aversion appears to contradict the idea that humans benefit from overconfidence. If people are extremely worried about losing, why would they confidently take risks?

The answer may be that human psychology does not perfectly balance confidence and caution in every situation.

People face countless decisions involving careers, investments, relationships, competition and business. It would be extremely difficult to calculate exactly how much confidence and caution should be applied to every individual situation.

As a result, the two tendencies can coexist.

A person may be highly confident about their abilities while simultaneously being reluctant to accept certain risks.

When Overconfidence Becomes Dangerous

Although confidence can provide advantages, excessive self-belief can also become destructive.

Overconfidence can contribute to:

• Poor investment decisions
• Risky driving
• Failed business ventures
• Unrealistic plans
• Bad leadership decisions
• Underestimating competitors
• Ignoring useful criticism
• Taking unnecessary personal risks

The problem is not confidence itself. The danger appears when confidence becomes disconnected from evidence.

Healthy confidence says, "I believe I can handle this."

Unhealthy overconfidence says, "There is no realistic possibility that I could be wrong."

That distinction matters.

How to Build Better Confidence

The goal should not necessarily be to eliminate confidence. Instead, people can try to make their confidence better calibrated.

One useful approach is to deliberately consider evidence that challenges your assumptions.

Before making an important decision, ask:

What could I be missing?

What evidence would prove me wrong?

Have I underestimated the risks?

What would someone with more experience say?

These questions do not require abandoning self-belief. They simply create space for reality to challenge your expectations.

Confidence works best when it is combined with feedback, experience and a willingness to reconsider mistakes.

The Bigger Lesson About Human Behaviour

The psychology of overconfidence reveals something important about how people operate.

Human behaviour is not always designed to produce perfectly accurate beliefs. Sometimes beliefs may serve social, motivational or evolutionary functions as well.

Confidence can encourage action. It can influence how others perceive us. It can help us pursue opportunities that we might otherwise avoid.

But the same mechanism can become dangerous when confidence grows faster than competence.

Perhaps the healthiest approach is therefore neither extreme humility nor blind self-belief.

Instead, aim for informed confidence: believe in your ability to improve and succeed, while remaining willing to question your assumptions.

After all, confidence can open a door, but ability, preparation and good judgement determine what happens after you walk through it.

Source

The Conversation UK on August 7, 2026, by Chris Dawson, Professor of Economics and Behavioural Science at the University of Bath, and David de Meza, Professor of Management at the London School of Economics and Political Science.

Disclaimer

This blog is intended for general educational and informational purposes only. It is a written summary and interpretation of published research and should not be treated as professional psychological, financial, medical or investment advice. Research findings can be more nuanced than a general-audience summary, and individual behaviour can vary considerably. Readers should consult appropriate qualified professionals when making important personal, financial or professional decisions.