Self-ownership entails that a person must be allowed to profit comprehensively from control of his own resources without being compelled to contribute to others.
Still even if we concede that property is the product of social rules, and that normative thinking about the former must be preceded by normative thinking about the latter, there might be facts about the human condition or our agency as embodied beings that provide philosophical premises for an argument that property relations should be established in one way rather than another. Clearly, there is at least one material object with which a person does seem to have an intimate pre-legal relation t