Corruption is a widespread phenomenon around the world. Yet, models of hierarchical agency relationships tend not to predict collusion. The paper demonstrates that allowing collusion may be optimal if the principal cannot commit to an incentive scheme once and for all. The optimal extent of...

An indivisible good is to be consumed by one of several agents. The consumption involves identity-dependent externalities to the non-consumers. Resale markets for such goods are analysed in various institutional settings with complete information, assuming the agents cannot commit to future...