Given these results, a diverse array of more sophisticated motivational accounts has been offered in the recent literature (For additional results and discussion, see also Roth 1995; Kagel et al. 1996; Pillutla and Murnighan 2003; Camerer 2003; Murnighan and Wang 2016.). One thing they have in common is that they are egoistic accounts, appealing in some way to what would advance a person’s self-interest. In the case of offerers, here are some of the motivational proposals that have been made: