Network structures both enable and constrain the development of social relations. This research investigates these features by comparing the development of commitments in structurally enabled and structurally induced exchange relations. We integrate ideas from the theory of relational cohesion and the choice process theory of commitment. In an experiment we manipulate and compare a structurally enabled relation with a structurally induced relation. The main hypotheses are that a structurally enabled relation generates a greater sense of control, more positive emotions, greater perceived cohesion, and more commitment behavior than a structurally induced relation. The results of the experiment support these hypotheses. The implication is that enabling and constraining features of network structures exert important effects on cohesion and commitment in relations within those structures. (Contains 3 figures, 3 tables and 16 footnotes.)