 A final set of debates to which the details of norm psychology are becoming increasingly relevant are those concerning the nature and explanation of moral progress. Recent progress is understood to have largely come in the form of expansions of the moral circle, the spread of inclusive norms, and the demoralization of invalid ones (Singer 1981; Buchanan &amp; Powell 2018; cf. Sauer 2019.) Much attention has focused on understanding changes in the distribution of norms that occur as the result of reasoning about norms (Campbell &amp; Kumar 2012), but important steps towards moral progress may also occur as the result of myopic, though not fully blind, processes of cultural evolution (cf. Kling 2016; Brownstein &amp; Kelly 2019). A more detailed empirical understanding of the relationship of internalized norms to rationalization, critical reasoning, and explicit argumentation (Summers 2017; Mercier &amp; Sperber 2017), along with a clearer view of the other psychological and social factors that influence norms and the dynamics of their transmission, will help further illuminate these important philosophical debates.