Firms competing on several geographical markets and/or products show mutual forbearance because of the reciprocal threats of reprisals. This tacit collusion is reinforced by the existence of spheres of influence. This research focuses on the impact of the spheres of influence on the competing...

During the last few years, the connection of complex networks has accelerated in a spectacular manner. Some of the advantages of this increasing use are well-known and are studied by theoretical works (network externalities). Nevertheless, this interconnection has created new types of risks...