 Imagine now that we live in a social order that satisfies the difference principle. There are certain facilities in society—say, certain educational facilities—that answer distinctively to the interests of those in the least advantaged group. The resources involved could have been deployed in ways that would have been better for those in the second least advantaged group, or the third least advantaged group, etc., so the arrangement as a whole is tilted in favour of one group in particular. Because it is tilted in this way, the pattern of interaction lacks the property of perfect mutuality: each citizen does not work for the interests of each of her fellow citizens in exactly the same way each of her fellow citizens works for her interests. Everyone works in a way that is distinctively oriented towards the interests of the least advantaged.