- Peter Descioli: Departments of Psychology and Economics, Brandeis University, Waltham, MA 02453, USA. pdescioli@gmail.com
The target article by Baumard et al. uses their previous model of bargaining with outside options to explain fairness and other features of human sociality. This theory implies that fairness judgments are determined by supply and demand but humans often perceive prices (divisions of surplus) in competitive markets to be unfair.