 In solving this problem of fungibility, philosophers have typically focused on features of the historical relationship of friendship (cf. Brink 1999, quoted above). One approach might be found in Sherman’s 1987 union account of friendship discussed above (this type of view might be suggested by the account of the value of friendship in Schoeman 1985). If my friend and I form a kind of union in virtue of our having a shared conception of how to live that is forged and maintained through a particular history of interaction and sharing of our lives, and if my sense of my values and identity therefore depends on these being most fundamentally our values and identity, then it is simply not possible to substitute another person for my friend without loss. For this other person could not possibly share the relevant properties of my friend, namely her historical relationship with me. However, the price of this solution to the problem of fungibility, as it arises both for friendship and for love, is the worry about autonomy raised towards the end of Section 1.2 above.