Supplementary materials for: Why do we punish? On retribution, deterrence, and the moderating role of punishment system

We investigated whether individuals’ punishment behavior aims at compensating for inflicted harm (i.e., retribution) or at deterring the offender from committing the offense again (i.e., deterrence), and whether punishment motives depend on the punishment system. Participants (N=149) assigned punishment for selfish decisions in a group resource allocation task under three conditions: Open punishment (the allocator is informed about the punishment, allowing for retribution and deterrence); hidden punishment (the allocator is not informed about the punishment, precluding deterrence); and unintentional offense (decision is made by the computer not the allocator, precluding retribution and deterrence). In line with retribution motives, participants assigned more punishment under hidden punishment compared to unintentional offense and open punishment. We found these differences in punishment between punishment conditions only under centralized punishment (i.e., punishment can only be executed by one group member), but not under decentralized punishment (i.e., each group member can punish). unknown unknown