“…Importantly, a robustly observed feature of such pure cooperation is that, despite playing a key role in promoting the collective good, the extent to which people cooperate with strangers varies markedly across cultures (Blake et al, 2015; Cappelen, Moene, Sørensen, & Tungodden, 2013; Gächter, Herrmann, & Thöni, 2010; Henrich et al, 2005; Henrich et al, 2010; Sapienza, Zingales, & Guiso, 2006; Yamagishi, Hashimoto, & Schug, 2008). …”