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 in which the value function to be optimized is multivariate in a general sense, and it is not simply given by the sum of the single agents' utility functions, the other consisting of a truly systemic component.