What the jam study found — and why the choice-overload effect has not replicated.
What the evidence says
- Excessive choice leads to decision paralysis and decreased satisfaction[1]
- Choice overload reduces likelihood of making any decision[1]
- Too many options increase regret and decrease happiness with choices made[1]
- Simplifying choices improves decision-making and life satisfaction[1]
- “Maximizers” (who seek the absolute best) suffer more from choice overload than “satisficers” (who seek good enough) — maximizers experience more regret, less satisfaction, and more depression[1]
- In the jam study, 30% of shoppers offered 6 options purchased against 3% offered 24 — a 10-fold difference, the larger display having drawn more people in[2]
- That result has not replicated. A 2010 meta-analysis of 63 conditions from 50 experiments (Scheibehenne, Greifeneder & Todd) found ”a mean effect size of virtually zero but considerable variance between studies”, and could not identify conditions sufficient for choice overload to occur reliably; the authors’ own attempts to repeat the jam and chocolate studies found no effect. Iyengar is reported to have acknowledged that the effect is context-dependent, not universal[3],[2]
- Extensive choice simultaneously increases enjoyment of choosing and frustration/difficulty — these are independent dimensions, not trade-offs[2]
- The mechanism is enhanced responsibility and anticipated regret (not satisficing) — people with too many options feel more responsible for their choice and more anxious about making the wrong one[2]