We might view human social organization in general in this lens: social organization exists to maximize the extraction of energy from the environment to the group and individual (X), and the efficiency of the conversion of extracted energy into offspring (E). This is identical to the claim that social organization exists to maximize the fitness of the group (Wilson and Sober 1994) and/or the individuals which compose the group (Nowak et al. 2010), given an energetic definition of fitness.