The hidden side of the Ultimatum Game: The role of motivations and mind-reading in a two-level one-shot Ultimatum Game

The main aim of our study is to investigate the role of motivations and mind-reading in a two-level one-shot Ultimatum Game with three players. Our intention is to analyse subjects’ behaviour in both the responder and proposer roles. In the responder role, we found that the difference between the subjects’ expectations and the actual offers was the major factor that influenced their decisions and motivations in receiving money. In the proposer role, our results showed a significant influence of mind-reading, with a positive association between the fairness of subjects’ offers and the subjects’ expectations about the recipients’ willingness to accept. Although a shared concept of fairness exists findings suggest that decisions and motivations seem to depend on expectations, either when they are directly experienced or when they are ascribed to the counterpart.