Illusory Superiority: Everyone Is Above Average

In Garrison Keillor's fictional Lake Wobegon, "all the women are strong, all the men are good-looking, and all the children are above average." It is a gentle joke about small-town self-regard. It is also an exact description of how most people, in most places, on most dimensions, see themselves. The statistical impossibility of everyone being above average has not discouraged anyone from believing they are.

The Driving Study and Its Siblings

The number most frequently cited in discussions of illusory superiority comes from a 1981 study by Ola Svenson at the University of Stockholm. Svenson surveyed American and Swedish college students about their driving ability and safety relative to their peers. Among US participants, 93% rated themselves as above the median in driving safety. Among Swedish participants, the figure was 69%. Both numbers are mathematically impossible for medians — at most 50% of any group can be above the median. Svenson's paper became foundational, and the 93% figure entered the cultural lexicon as shorthand for the bias.

But driving is just the most memorable example. The same pattern appears across an enormous range of domains:

• Most college professors rate themselves as above-average teachers (studies at various institutions find 90–94% self-rating as above median).
• In surveys of high school students, 70% rate themselves above average in leadership ability; only 2% rate themselves below average.
• In workplace contexts, most employees rate their own performance as above average, a pattern documented across industries from finance to healthcare to engineering.
• Most people rate themselves as more ethical than their peers, more unbiased, and more rational.
• Most people consider themselves better-than-average friends, parents, and romantic partners.

The effect is not culture-neutral — research suggests it is stronger in Western, individualistic societies than in East Asian contexts, where modesty norms and collectivist values temper self-enhancement. But even in cultures with low average self-enhancement, below-average self-rating remains rare. The floor is high everywhere.

The Lake Wobegon Effect: A Taxonomy

Illusory superiority is not a single, monolithic bias but a family of related phenomena. Several mechanisms contribute:

Better-than-average for easy tasks, worse-than-average for hard ones

An important qualification, introduced by Kruger (1999): people tend to rate themselves above average on tasks they perceive as easy or where they feel competent, and below average on tasks they perceive as difficult. This "worse-than-average effect" for difficult tasks is the mirror image of illusory superiority. It suggests the bias is not simply self-flattery but reflects a failure to accurately calibrate self-assessment against actual performance — in both directions.

Comparison standards are manipulated unconsciously

When people rate themselves against "average peers," they tend to construct a comparison standard from a biased sample — particularly acquaintances and people they know well, who are not a random sample of the population. They also tend to weight the attributes on which they personally excel more heavily in their definition of what counts as "good" at something. A driver who is genuinely careful but frequently gets lost might define "good driving" in terms of caution and safety rather than navigation — a definition that conveniently favours their own profile.

Selective memory of performance

People tend to remember their successes more vividly and attribute them to ability, while attributing failures to circumstances. This self-serving bias in memory and attribution feeds directly into inflated self-assessments. When you cannot reliably recall your failures relative to your successes, your mental model of your own ability is skewed upward from the start.

The Dunning-Kruger Distinction

Illusory superiority is frequently conflated with the Dunning-Kruger Effect, but the two are related rather than identical. Dunning and Kruger (1999) demonstrated that people with low competence in a domain tend to dramatically overestimate their performance — a specific finding about the correlation between incompetence and overconfidence. Their mechanism was metacognitive: the skills needed to perform well in a domain are often the same skills needed to assess performance in that domain. If you lack the skills, you also lack the ability to recognise your lack.

Illusory superiority is broader: it affects people at all competence levels, not just the least competent. Even genuinely skilled people tend to rate themselves higher than their rank in the actual distribution justifies — they are above average, but they think they are more above average than they are. The overconfidence effect runs across the entire distribution, not only at the bottom.

Consequences in the Real World

Education and Academic Performance

Students who systematically overrate their mastery of material are less likely to study effectively. If you believe you already understand something well, you are unlikely to engage in the kind of effortful retrieval practice that actually consolidates learning. Research on metacognition and academic performance consistently finds a negative correlation between overestimation of comprehension and actual test performance — not because overconfidence causes failure, but because miscalibrated self-assessment prevents the corrective study behaviour that could have produced success.

This connects to a broader point about feedback. Accurate self-assessment requires accurate feedback, and most educational environments do not provide feedback that allows students to calibrate precisely where they are in the distribution of their peers. Grades tell you where you are in absolute terms, but human self-assessment is primarily social comparison. Without clear comparative data, optimistic defaults prevail.

Workplace Performance Management

Performance reviews in organisations consistently reveal a disconnect between self-assessment and manager assessment. In studies of 360-degree feedback systems, self-ratings tend to be higher than peer ratings, subordinate ratings, or supervisor ratings — and the gap is larger among lower performers than higher ones. High performers are often slightly underconfident; low performers are markedly overconfident.

This creates practical problems for performance management: employees who believe they are high performers but receive average evaluations experience the rating as unjust rather than informative. Defensiveness replaces reflection. The bias turns feedback into conflict.

Public Health

Illusory superiority about health behaviours has real epidemiological consequences. Smokers consistently rate their own health as better than that of other smokers and overestimate their resistance to smoking-related illness. People who drink alcohol in harmful quantities frequently rate their drinking as more controlled than it is relative to peers. Drivers who engage in risky behaviours (speeding, phone use) tend to rate their own driving as safer than average even while acknowledging that those specific behaviours are risky in others.

This "optimistic exceptionalism" — I'm different, the risks that apply to others don't quite apply to me — is a powerful inhibitor of precautionary behaviour and health behaviour change. If you genuinely believe you are an above-average driver, the instruction to "drive more safely" does not register as personally applicable.

The Bias Blind Spot

One particularly ironic wrinkle: most people also rate themselves as less susceptible to cognitive biases than other people. This bias blind spot means that learning about illusory superiority tends not to reduce it. Participants who read about the bias and its evidence still rate themselves as less affected by it than their peers — which is itself a demonstration of the bias operating in real time.

The bias blind spot makes debiasing strategies for illusory superiority particularly challenging. The standard cognitive debiasing approach — raise awareness, prompt reflection — runs directly into the motivated perception that one is already adequately reflective and appropriately humble. You cannot fix a miscalibration you can't perceive.

Reducing Illusory Superiority

The most effective interventions are structural rather than attitudinal:

• Comparative data: Providing people with actual percentile rankings rather than absolute scores gives the social comparison information that self-assessment normally distorts. "Your driving score is at the 61st percentile" is more calibrating than "you scored 7 out of 10."
• Incentivised accuracy: When accurate self-assessment has real consequences — money, selection, status — people tend to become more accurate. Skin in the game reduces the luxury of self-flattery.
• Specific behavioural feedback: General feedback ("you're a good communicator") is easy to fit into a self-enhancing narrative. Specific, behavioural, comparative feedback is harder to reinterpret.
• Implementation intentions: Research by Peter Gollwitzer suggests that specific "if-then" plans (if I find myself assuming I understand this, I will test myself) can interrupt the default self-enhancing heuristic.

We are not all above average. Half of us, by definition, are below the median on any given dimension. The important question is not how to make people feel worse about themselves, but how to help them form accurate pictures of where they actually stand — because accurate self-assessment is the precondition of effective learning, meaningful feedback, and genuine improvement.

Sources & Further Reading

• Svenson, O. "Are We All Less Risky and More Skillful than Our Fellow Drivers?" Acta Psychologica 47, no. 2 (1981): 143–148.
• Kruger, J. "Lake Wobegon Be Gone!" Journal of Personality and Social Psychology 77, no. 2 (1999): 221–232.
• Dunning, D., Meyerowitz, J. A., & Holzberg, A. D. "Ambiguity and Self-Evaluation." Journal of Personality and Social Psychology 57, no. 6 (1989): 1082–1090.
• Hoorens, V. "Self-Enhancement and Superiority Biases in Social Comparison." European Review of Social Psychology 4, no. 1 (1993): 113–139.
• Pronin, E., Lin, D. Y., & Ross, L. "The Bias Blind Spot." Personality and Social Psychology Bulletin 28, no. 3 (2002): 369–381.
• Wikipedia: Illusory superiority