Using a dictator game experiment, we examine whether the introduction of group identities affects giving. Group identities can activate feelings of in-group love and out-group hate to create an in-group bias. In addition, group identities may spawn social sanctions that are designed to reinforce...

This paper reports on an online experiment that tests whether the in-group bias in preferences is crowded-out/in when a policy is introduced that materially encourages in-group biased behaviour. The bias in preferences is crowded-out in the aggregate and the policy is not successful: it does not...

Social information 'nudges' concerning how others perform typically boost individual performances in experiments with one group reference point. However, in many natural settings, sometimes due to policy, there are several such group reference points. We address the complications that such...

Using a dictator game experiment, we examine whether the introduction of group identities affects giving. Group identities can activate feelings of in-group love and out-group hate to create an in-group bias. In addition, group identities may spawn social sanctions that are designed to reinforce...