Too many choices trigger choice overload, where users become overwhelmed, hesitate, delay decisions, or abandon them entirely. The landmark Iyengar and Lepper jam study demonstrated the effect: 30% of visitors purchased from a 24-option display versus 60% from a 6-option display, showing that more choices produced fewer purchases despite attracting more initial attention.
Choice paralysis occurs when users cannot process or compare all available options effectively, requiring too much mental effort to evaluate tradeoffs. Each additional option increases cognitive load because the brain must weigh new information against everything already considered. Navigation research indicates menus should limit options to three to six items; beyond that threshold, choice overload and indecision set in. Multiple CTAs on a single page fragment user attention and reduce conversion compared to a single primary action. The psychological mechanism is limited working memory: when choices exceed cognitive capacity, users default to simpler heuristics (picking the first option, choosing the cheapest, or avoiding the decision altogether). Research across e-commerce contexts shows customers given too many choices are ten times less likely to buy. The remedy is not removing all options but structuring them so the user faces a manageable set at each decision point.