An alternative theory of romantic relationships is Rusbult’s Investment Model. He suggest that equity is not the most important factor when it comes to maintaining relationships but investment. He suggests that the more investment people put into a relationship e.g. time, money, children, house, the less likely that relationship is to break down rather than the fairness of the relationship. Therefore, equity may not be the sole reason relationships are maintained, their may be other factors involved also, limiting equity theory as a theory of romantic relationships.