 In it, he addressed the accepted belief at the time by sociologists and political scientists that groups were necessary to further the interests of their members.Olson argued that individual rationality does not necessarily result in group rationality, as members of a group may have conflicting interests that do not represent the best interests of the overall group.Olson further argued that in the case of a pure public good that is both nonrival and nonexcludable, one contributor tends to reduce their contribution to the public good as others contribute more.