Before revision:  In this paper we extend such  notion to the case in which the value function to be optimized has two components, one being the sum of the single agents' utility functions, the other consisting of a truly systemic component.
After revision:  In this paper we extend such notion to the case when the value function to be optimized has two components, one being the sum of the single agents' utility functions, the other consisting of a truly systemic component.