Complementarity is a dyadic state, primarily referring to relationships in which one person is dominant and the other submissive.  In this talk, I will equate dyadic complementarity with the presence of social hierarchy, and I will argue that this state occurs frequently, easily, and quickly.  Further, I will suggest that people enjoy it. I will discuss the implications of these arguments for a variety of literatures including automatic behavior, relational schema, and contrast and assimilation in self and other perceptions.  The studies, taken together, will show how easily hierarchies can come to exist and some of the cognitive and motivational processes that support them.