Can states permissibly enforce mandatory participation in the provision of public goods? Usual justifications of state action here appeal to the fact that such goods are very good for people. Arthur Ripstein argues that states can compel provision of public goods, but that the best explanation of this is grounded, not in the costs and benefits of the provision to the compelled parties, but in the parties’ moral status as independent agents. I argue that Ripstein’s alternative account poses more problems (...) than it solves. Our best hope in grounding mandatory cooperation is to do so with reference to the duties that we have to serve people’s interests, including interests in autonomy, welfare, and being respected on account of one’s moral status. (shrink)