One-shot interaction and repeated interaction often co-exist in the real world.We study possible behavioral effects of this co-existence in a principal-agent setting, in which a principal simultaneously employs a permanent and a temporary agent. Our experimental results indicate that there is "discrimination" between the two agents and that the available information for agents determines the extent of this discrimination, even though the theoretical solution of the game implies equal treatment of agents.Discrimination is, thus, a consequence of reciprocity. Agents that are discriminated against react negatively by withholding effort.
JEL classification: C72, C91, D21, J31Keywords: principal-agent problem; permanent and temporary employment; fairness; wage discrimination # We would like to thank Jianying Qiu and Torsten Weiland for their excellent help in conducting the experiments. Participants of the ESA European Meeting in Lyon, the IAREP/SABE World Meeting in Rome, and the doctoral seminar at the University of Jena provided helpful comments on an earlier version of the paper.