We elicit human conditional punishment types by conducting experiments. We find that their punishment decisions to an individual are on average significantly positively proportional to other members’ punishment decisions to that individual.

A rich body of literature has proposed that pairs behave significantly differently from individuals due to a number of reasons such as group polarization. This paper experimentally compares cooperation behaviors between pairs and individuals in a finitely-repeated two-player public goods game...

Unequally-distributed resources, whether people’s income or competence, are ubiquitous in our real world. Whether to promote competition or to lead to a more equal environment is often in question in societies or organizations. With heterogeneous endowments, we let subjects collectively choose...