Nearly everyone thinks they're above average.

Ask a room full of drivers a simple question: are you a better or worse driver than the median person in this room? Reliably, most of the hands go up for “better.” In a widely cited 1981 study, the Swedish psychologist Ola Svenson found that a large majority of drivers placed themselves in the safer and more skillful half of the distribution — with a striking share ranking themselves near the very top.

Which is, of course, arithmetically impossible. Half of any group is by definition below the middle. The median is the line that puts exactly as many people on one side as the other. So a room where most people are above it isn’t overconfident; it’s a logical contradiction wearing a confident face. And yet the pattern — call it the better-than-average effect, or illusory superiority — is one of the sturdiest findings in social psychology. It shows up for driving, intelligence, health, honesty, leadership, and, most deliciously, for the ability to judge other people without bias. Most of us rate ourselves as more objective than average, which is a sentence that should make you laugh and then squint.

Why does a whole species get this wrong in the same direction? Not one reason — a few, stacked.

The first is that most of the traits we rank ourselves on are gloriously vague, which lets everyone quietly choose the yardstick they happen to win on. “Good driver” means cautious to the careful person and skilled to the fast one. Each grades the exam they’d ace. The second is egocentric: you have enormous, high-resolution data on your own intentions — every time you meant well, checked your mirror, thought it through — and almost none on anyone else’s inner life. You compare your rich inside to everyone else’s thin outside, and the inside always looks better. The third is plain motivated reasoning: believing you’re above average feels good, and the mind drifts toward what feels good unless something stops it.

Here’s the twist that keeps the effect from being simple vanity, and it’s the part most people never hear. On hard or rare skills, the direction flips. Ask people to rate themselves at juggling, or computer programming, or drawing a face — things few can do and everyone knows are difficult — and, on average, they rate themselves below average. Justin Kruger documented this worse-than-average effect in 1999. So illusory superiority isn’t blanket overconfidence. It tracks how easy the task feels: common and easy tips you above the line, rare and hard tips you below it. That’s a strong hint the whole thing runs partly on your reference point — how you imagine “the average person” — rather than on pure ego.

This is where the famous Dunning-Kruger effect enters, and where honesty is required. The popular version — that the least competent are too incompetent to notice they’re incompetent — is real in outline, but its size and even its interpretation are genuinely contested. A meaningful chunk of the classic zigzag chart turns out to be regression to the mean plus this same better-than-average effect showing through noisy self-estimates. The phenomenon isn’t fake; it’s just smaller and less magical than the meme. Worth knowing, so you’re not the person confidently over-claiming a study about people who confidently over-claim.

And it isn’t even universal. The effect is weaker, sometimes absent, occasionally reversed, in some East Asian samples, where self-criticism is more of a social default than self-enhancement. So this isn’t a fixed law of the human brain. It’s partly a habit of a particular culture — which should itself make anyone pause before treating their own self-image as a readout of reality.

The genuinely unsettling part is the one to sit with. You cannot feel this bias from the inside. The whole trick of it is that it includes the belief that you, specifically, are the clear-eyed one — the exception, the accurate self-assessor in a room of inflated egos. There’s no introspective alarm that rings when you’re doing it, because the doing of it feels exactly like being right. The only real defense is external: an honest measurement, a fixed standard instead of a felt one, a person who’ll tell you the truth. Left alone with just your own sense of yourself, the odds are excellent that you’re standing to the right of a line you can’t see.

The science, to look up: the better-than-average / above-average effect — Ola Svenson (1981), drivers; illusory superiority; the worse-than-average effect on difficult tasks — Justin Kruger (1999); the Dunning-Kruger effect (Dunning & Kruger, 1999) and the regression-to-the-mean critiques of it; cross-cultural work on weaker self-enhancement in East Asian samples (e.g. Heine & Hamamura).