Reciprocity obligations to fellow cooperators in basic security schemes amount to no more than a requirement to contribute a fair share to supplying those goods.

This line of thought prompts several questions. If stringent egalitarian duties to needy people arise only because the needy participate in a scheme of cooperation with the non-needy, then strategic action to avoid the duties seems permissible. If the rich separate from the poor and form their own distinct political communities, the reciprocity argument will no longer support the claim that the rich have substantial obligations to the poor. One might question whether genuine justice obligations