“…For example, an observer reports that, among the !Kung, a hunter suspected of not having fully participated in the hunt would swear "by the great captain nu χu, and all [would] believe him" (Lebzelter, 1934, p. 109). Experimental results show that U.S. and French participants take promises (which can be considered as a weak form of oath), as well as oaths seriously when playing trust games or similar economic games, even in the absence of possibility to punish liars (Charness & Dufwenberg, 2006;Jacquemet, Luchini, Shogren, & Zylbersztejn, 2018; see also Balliet, 2010;Ostrom, Walker, & Gardner, 1992).…”