This paper illustrates the application of functional-equations results in population ethics.In an intertemporal framework, we provide characterizations of several classes of variablepopulationsocial orderings that may depend on individual lengths of life in addition tolifetime utilities...

We consider a cooperative model of bargaining where the location of thedisagreement point may be uncertain. Based on the maximin criterion, we formulate anex ante effciency condition and characterize the class of bargaining solutions satisfyingthis axiom...