Popularized by psychologists Sheena Iyengar and Mark Lepper's 2000 "jam study." A supermarket display of 24 jams drew more browsers than a 6-jam display, but the 6-jam table converted to actual purchases far more often. Author Barry Schwartz brought the idea to a wider audience in "The Paradox of Choice" (2004).
Where Hick's Law is about speed — more options, slower decisions — choice overload goes further: people can abandon the decision entirely, or feel less satisfied afterward, second-guessing whether a better option was buried in the list.
In the demo, A's cursor keeps circling a 24-item shelf and never completes a pick before resetting. B picks confidently from 6.
When to use
Use this when deciding how many products, plans, or filters to surface. Test the assumption that "showing more sells more" against real conversion data.