Abstract:Politics is the process of determining resource allocations within and between groups. Group life has constituted a critical and enduring part of human evolutionary history and we should expect the human mind to contain psychological adaptations for dealing with political problems. Previous research has in particular focused on adaptations designed to produce moral evaluations of political outcomes: is the allocation of resources fair? People, however, are not only concerned about outcomes. They also readily produce moral evaluations of the political processes that shape these outcomes. People have a sense of procedural fairness. In this chapter, we identify the adaptive functions of the human psychology of procedural fairness. We argue that intuitions about procedural fairness evolved to deal with adaptive problems related to the delegation of leadership and, specifically, to identify and counter-act exploitative leaders. In the chapter, we first introduce the concept of procedural fairness, review extant social psychological theories and make the case for why an evolutionary approach is needed. Next, we dissect the evolved functions of procedural fairness and review extant research in favor of the evolutionary account. Finally, we discuss how environmental mismatches between ancestral and modern politics make procedural fairness considerations even more potent in modern politics, creating a powerful source of moral outrage.Keywords: procedural fairness, procedural justice, evolutionary psychology, politics, dominance, leadership, strategic moralization 3 Politics is the process of determining resource access (Petersen 2015). In a classical definition, the political scientist, David Easton (1953), thus defined politics as the process of determining the "authoritative allocation of values for a society." In more plain terms, another classical definition described politics as about "who gets what" (Lasswell 1950). These definitions highlight that politics is ultimately about outcomes: who gets a resource and who does not. Some researchers of politics have taken this to imply that outcomes are all people care about in politics. As Ulbig (2002, p. 793) notes, the traditional notion has been that "when people get what they want they do not care how they get it". Popkin (1991, p. 99), for example, holds that people "care about ends not means; they judge government by results and are . . . indifferent about the methods by which the results were obtained". is their strategy for achieving those interests? Research has documented that such a focus is, at least in part, demand driven: people crave information about the process leading to outcomes and the strategic aspects involved (Smith et al. 2007;Trussler & Soroka 2014).This appetite for information about what goes on behind the scenes of political outcomes extends even to the personal lives of politicians: who are they, whom are they personally affiliated with, and do they practice what they preach politically? This latter observation illustrates an importan...