Decision Fatigue

The deterioration of decision quality after a long session of making choices. First studied in depth by Baumeister and Vohs, decision fatigue describes how the brain's executive function depletes with use, leading to faster, more impulsive choices — or to the avoidance of choices altogether. In an upsell context, a customer who has compared products, read reviews, and applied discount codes is already fatigued before reaching the checkout. Presenting an additional offer at that moment invites rejection. The solution is to time offers for moments of cognitive recovery, not cognitive depletion.

Example: Parole board judges in a well-known study granted more favorable rulings after a meal break than after a long session of consecutive decisions — a pattern that applies equally to consumer decision-making.