CLOSE RELATIONSHIPS 1
ICA-8-11269
Darwin’s Dangerous Idea, the Banker’s Paradox, and the Playing of Non-Zero Sum Games:
Developing an Integrated Model of Close Relational Functioning
An evolutionary framework is used to develop a model of relational functioning among close
relational partners. The model proposed focuses on the collaborative nature of close relationships and
attempts to highlight two adaptive mechanisms important in creating non-zero sum outcomes among
highly interdependent parties. First, our model emphasizes the importance of reciprocity in creating
mutually beneficial outcomes through games of exchange (i.e., resource exchange). Additionally, we
articulate how the preference for similarity would have been useful when creating non-zero sum rewards
through games of coordination. In particular, we focus on the unique role that shared interests and mutual
knowledge play when individuals attempt to pursue common goals through joint activity. The
implications of our model are discussed with respect to a host of relational issues ranging from
uncertainty reduction to satisfaction and commitment.