Rejection of unfair offers in the ultimatum game is no evidence of strong reciprocity
Yamagishi, T., Horita, Y., Mifune, N., Hashimoto, H., Li, Y., Shinada, M., Miura, A., Inukai, K., Takagishi, H., & Simunovic, D.
Proceedings of National Academy of Sciences U.S.A.
109
20364
20368
10.1073/pnas.1212126109