Contextual effects of monetary incentives on acceptance of unfair offers in the ultimatum game.
Level 2 - randomized trial
Level 2 by design analogy (controlled behavioral experiments; non-clinical study)
PubMed 42209640 · doi:10.1038/s41598-026-55524-7
What was done
Four complementary behavioral experiments assessed how monetary incentives influence responder decisions to accept or reject unfair offers in the Ultimatum Game (UG). Experiment 1 tested a hypothetical one-shot questionnaire scenario. Experiment 2 evaluated decisions using real monetary incentives while manipulating fairness and responder gains. Experiment 3 used a repeated virtual UG across an expanded range of monetary gains and fairness levels. Experiment 4 tested responses to a fixed, highly unfair offer with real monetary rewards, comparing college students with working adults.
What was found
The abstract reports no numerical values, sample sizes, or test statistics. Experiment 1 did not find an interaction between monetary incentives and offer fairness. Experiment 2 showed main effects of fairness and responder gain on acceptance, but no interaction. Experiment 3 found that increases in responder gain led to larger increases in acceptance rates for lower-fairness offers compared to higher-fairness offers. Experiment 4 found that gain-related increases in acceptance under highly unfair offers were markedly steeper among college students than among working adults.
Why it matters
This study clarifies inconsistent findings in behavioral economics by showing that the balance between fairness concerns and monetary self-interest depends on gain range, task context, and participant background.
Limits
The abstract omits sample size, detailed participant demographics beyond college students versus working adults, numerical effect sizes, and precision estimates. Findings rely on stylized laboratory economic games that may not fully generalize to real-world bargaining settings.
Cited by
- context In the ultimatum game, responders offered an 80/20 split are indifferent and reject the offer roughly 50% of the time.