For what it’s worth, my view is that it is unlikely any one of the proposed motives in the ultimatum and dictator literatures is going to be sufficient by itself to explain the observed patterns of behavior. Nor, to be fair, are they usually intended by researchers to be sufficient either. Rather, motives concerned with good (monetary) outcomes for the self are no doubt part of the story. But so too are motives concerned with fairness. And so too are one or more additional egoistic motives, such as not wanting to appear selfish. A complex, multi-motive model is what is needed going forward (see also Forsythe et al. 1994: 362; Roth 1995; Güth 1995; Kagel et al. 1996: 102; Pillutla and Murnighan 2003: 254; Dana et al. 2006: 195; Dana et al. 2007: 78; Murnighan and Wang 2016: 87).