Inequality-induced emotions might promote cooperation in evolutionary games Jiawei Wang, Liming Zhang, Haihong Li, Qionglin Dai and Junzhong Yang Eur. Phys. J. B, 96 3 (2023) 37 Published online: 25 March 2023 DOI: 10.1140/epjb/s10051-023-00508-z