Humans are famously obedient to authority (e.g., Milgram, 1963), and there is a great deal of empirical evidence that males in particular possess cognitive adaptations to assess dominance status and modify behavior accordingly. A number of visible traits including stature (Hensley, 1993), eye color (Kleisnera, Kočnara, Rubešováb, & Flegra, 2010), and facial structure (Mueller & Mazur, 1996) have been shown to signal dominance, and humans seem to use auditory clues as well. Subordinate men, for instance, unconsciously adjust their vocal pitch to that of a dominant conversation partner (Gregory & Webster, 1996; see also Gregory & Gallagher, 2002; Puts, Gaulin, & Verdolini, 2006; Puts, Hodges, Cárdenas, & Gaulin, 2007). Thus, humans seem to have a number of psychological adaptations that allow us to perceive and navigate status hierarchies effectively.
Hierarchy and stratification are important but not ubiquitous in human societies (Dubreuil, 2010), and there is considerable variation even among types of societies that are often painted with broad strokes. For example, hunter-gatherers are frequently labeled as egalitarian, but many such groups include some stratification (Kelly, 1995). Status differences based upon sex and age are particularly common (e.g., Hart and Pilling, 1979). Stratification may have its greatest incidence in larger human societies, but its seeds are present even among the smallest, most homogeneous groups.
Stratification is maintained through mechanisms of social control. Coercion is one obvious way to maintain control, but it can be costly. Manipulation through the use of signals is often a less costly and less risky alternative. As Schloss and Murray (2011) note, judgmental gods and judgment-based afterlife beliefs are not universal. Considerable evidence exists that such beliefs are rare among hunter-gatherer, small-scale, and egalitarian societies, and common among food producing, large-scale, and hierarchical societies. Swanson (1960) may have been the first to note an association between stratification and the belief in supernatural powers that reward and punish individuals according to how well they behave (see also Peregrine, 1996). Similarly, Roes and Raymond (2003) found an association between social complexity and the belief in moralizing gods. Most recently, Dickson, Olsen, Dahm, and Wachtel (2005) found an association between subsistence type (a common proxy for degree of stratification) and the belief that the quality of one's experience in the next life is contingent upon how one behaves in this one. While only 10% of food collecting societies maintain such beliefs, nearly 90% of plow agricultural societies have them. As societies become more socially, economically, and politically stratified, punitive, judgmental gods and judgmental afterlife beliefs become much more common.
Hierarchies can also serve to protect individuals from those lower in rank. If a worker objects to something her boss is telling her to do, the boss can always appeal to the hierarchy: “I, too, am just following orders.” When the top of the hierarchy is occupied by a capricious, omniscient, incorporeal being whose primary concern is obedience, a ruler's accountability is reduced even further. By enforcing the divinely prescribed order of things, the ruler is merely doing his or her job.
The hierarchical approach creates a framework in which the CE and PA approaches can be seen as working together. The CE viewpoint suggests that the threat of supernatural punishment enhances cooperation among all members of religious groups. An unstated assumption is that this cooperation benefits all participants. While the hierarchical perspective does not contradict that argument, it suggests that costs and benefits may be distributed unequally – those nearer the top of the hierarchy may benefit much more than those at the bottom. The PA account suggests that individuals subscribe to beliefs that include supernatural punishment in order to avoid real world punishment. In the hierarchical view, elites are using the threat of supernatural punishment as an inexpensive means of encouraging non-elites to follow the rules, but real-world punishment is, of course, a fallback option.
One of the predictions of the hierarchical perspective has already been supported: there is indeed a cross-cultural association between social stratification and belief in judgmental gods. We also predict a relationship at the individual level between the degree to which people believe in the hierarchical system and the strength of their beliefs in supernatural punishment.