A knowledge problem for the civic friendship view of political liberalism

John Rawls and those sympathetic to his views defend a moral principle called the criterion of reciprocity. Some argue that the moral reasons for complying with the criterion of reciprocity are derived from civic friendship, a valuable relationship of collective agency that one can sustain with one's fellow citizens. In this article, I pose what I call the knowledge problem for civic friendship. I argue that citizens have only limited information about whether others are complying with the criterion of reciprocity. Furthermore, I argue that this fact means that citizens only have weak moral reasons to comply with the criterion of reciprocity.