 Contractualist conceptions of morality attempt to derive all of morality, together with full moral status of individuals, from a hypothetical reciprocal agreement (entered into under conditions specified variously by different versions) among rational agents (see the entry on  contractualism).  The claim is that all able parties would agree (make a contract) to be bound and to bind others to treat them in the agreed-upon ways (that encompass FMS). These views work well to explain why the capacity to enter and adhere to such a reciprocal agreement, which includes the capacity to both demand moral status for oneself and to respect the moral status of others by assuming duties and responsibilities, would confer FMS on an individual.