A full statement of the rational theory, including the incentive and knowledge effects, is as stated earlier: Your trust turns not directly on your own interests but rather on whether these are encapsulated in the interests of the trusted. You trust someone if you believe it will be in her interest to be trustworthy in the relevant way at the relevant time, and it will be in her interest because she wishes to maintain her relationship with you. Some accounts of trust do not specifically include reference to the trusted's interest in being trustworthy toward the truster but merely require an expectation that the trusted will fulfill the trust (Barber 1983; Gambetta 1988, 217-18; Dasgupta 1988). Adequate reason for such an expectation, however, will typically turn on an assessment of likely future incentives.

DEFINE: Clarifies the rational theory of trust: trust rests on the trusted party's encapsulated interests in maintaining the relationship, not just on an observed expectation of fulfillment.

Russell Hardin, Trust and Trustworthiness, loc. 111