 A closely related idea has to do with mutuality (section  4.4  and  4.5 above). When members of society reason in terms of their common interests in liberty and opportunity, they assess policies from a standpoint that does not distinguish between one citizen and another. They each accord the interests of their fellow citizens the very same status in their reasoning that they accord to their own interests. When citizens do their parts in a social arrangement that answers to common interests, and they do so on the grounds that the arrangement serves common interests, citizens realize a form of solidarity that is perfectly mutual: each citizen works for the interests of each her fellow citizens in exactly the same way that each of her fellow citizens works for her interests.