Collusion is an agreement between two or more firms designed to limit competition among the group. This chapter considers the conditions that feasible agreements must satisfy in terms of the fundamental trade-off of increased payoffs from continuing participation and payoffs from ceasing...

In an extended version of d'Aspremont and Jacquemin's (1988) R&D competition model we find a region where the game is a prisoner's dilemma: firms still invest in R&D but they would obtain a higher profit by not investing at all. In a repeated version of the game, we prove that firms implicitly...