 Consider the case of friendship. Friendship is a social relationship that requires those who stand in the relationship to think and act in ways that embody a particular form of mutual concern. The relevant form of concern incorporates the basic requirements of morality—i.e., what Scanlon (1998) calls “the morality of right and wrong”—as friends must not lie to each other, assault each other, or take unfair advantage of each other. But even strangers are required to conform to these basic moral standards. What distinguishes friendship is that the form of mutual concern it involves goes beyond basic morality and requires friends to maintain certain patterns of conduct on the grounds that these patterns serve certain common interests.