There might even be relationships that I value in themselves and not primarily because they are causally connected to certain other benefits that I get from them. For example, I love certain people and have rich friendships with others. Such relationships are at one extreme of the range of encapsulated interest, and the relationship between Trifonov and the lieutenant colonel is at the other, minimal, extreme. Many of our relationships with others develop from relatively minor exchange interactions and become much richer relationships of fairly broad reciprocity.

Russell Hardin, Trust and Trustworthiness, loc. 69