“…Social cooperation, its evolution and stability can be understood from a number of perspectives: social value orientation (see Balliet et al, 2009); social norms (e.g., Buckholtz and Marois, 2012;Fehr and Fischbacher, 2004); group bias (e.g., Dorrough et al, 2015;McAuliffe and Dunham, 2016); conditional cooperation or reciprocity (e.g., Kocher et al, 2008;Fischbacher and Gaechter, 2010;Smith, 2013); context-specificity (e.g., Rand and Nowak, 2013); and so on.…”