sequences of revenge. Journal of Personality and Social Psychology, 95 (6), 1316-1324; de Quervain, D.J-F., Fischbacher, U, Treyer, V., Schellhammer, M., Schnyder, U., Buck, A., & Fehr, E. (2004). The neural basis of altruistic punishment. Science, 305, 1254-1258; Fehr, E., & Gachter, S$. (2002). Altruistic punishm