Commitment and satisfaction in romantic associations: A test of the investment model

Two experiments were designed to test the adequacy of the investment model of developing relationships in predicting satisfaction with and commitment to ongoing associations. According to the investment model, attraction to and satisfaction with a relationship is a function of a comparison of the relationship outcome value (both rewards and costs) to the individual's expectations, or comparison level. Commitment to a relationship is said to be a function not only of the relationship outcome value, but also the quality of the best available alternative and the magnitude of the individual's investment in the relationship. The intrinsic or extrinsic investment of resources serves to increase commitment by increasing the costs of leaving the relationship. Thus, increases in investment size, decreases in alternative value, and increases in relationship value should increase commitment to an ongoing relationship. In Experiment 1, a role-playing study, commitment to relationships increased with intrinsic and extrinsic investment size and decreased with the value of alternatives, but was not appreciably affected by relationship costs. Satisfaction/attraction significantly increased as relationship costs decreased. In Experiment 2, a survey of ongoing romantic associations, satisfaction/attraction was predicted by relationship reward value and relationship cost value. Commitment to relationships increased as relationship reward value and investment size increased and as alternative value and relationship cost value decreased, although the effects of cost value were weak.