Once they have been initiated, trust relationships are maintained in at least two large classes of ways: through direct recognition of the value of the relationship and through indirect feedback, which stimulates continuation or iteration of the reciprocal dealings that constitute the relationship. The mode of direct recognition may be the whole story for many dyadic trust relationships. You and I each know that continued interaction with each other will benefit us. One reason mutual trust seems, on a subjective assessment, to be so commonplace in the range of all trust relationships is that it is so easily maintained and understood. Additionally, as noted in chapter 1, mutual trust gives each party an extra reason for thinking the other trustworthy: that the other benefits from being in the relationship.

Russell Hardin, Trust and Trustworthiness, loc. 662