The lack of knowledge about others and accurate a priori assessments of the costs and rewards of helping are difficult, making relationships in market pricing climates less stable and more dependent on the outcomes of the last exchange. Because of the tenuous nature of interpersonal interactions in this climate, decisions to help will be based in part upon trust that is grounded in the direct benefits anticipated from the relationship. The threat of sanctions for trust violations and promise of rewards for expected behavior will be noticeable.