cognitive bias

A cognitive bias is a built-in glitch in how we judge things — a place where the mind reliably tilts away from the cold, correct answer. It isn't stupidity or carelessness; it's the price we pay for thinking fast. To get through a busy day, the brain leans on shortcuts, and most of the time they serve us well. But in certain situations those same shortcuts steer everyone wrong in the same direction, like a shopping cart with one wobbly wheel that always pulls left.

Three famous ones show the pattern. In anchoring, the first number you hear quietly drags your guess toward it — see a coat marked "was $400, now $150" and $150 feels like a steal, even if the coat was never worth $400. In the availability bias, whatever springs to mind easiest feels most likely, so a single news story about a shark or a plane crash can scare us more than the everyday risks that actually harm far more people. And in loss aversion, the sting of losing $20 hurts more than the joy of gaining $20 pleases — so we cling to losing bets and pass up fair gambles.

Here's the key thing people get wrong: knowing about a bias usually doesn't switch it off. These tilts run underneath awareness, automatic as an optical illusion you can't un-see even after it's explained. The fix isn't to "try harder to be rational" — it's to redesign the situation: slow down for big decisions, get a second opinion, or set up rules and checklists that catch the wobble before it costs you.