@TechReport{iza:izadps:dp16947, author={Jetter, Michael}, title={On the Post-Enlightenment Evolution of Moral Universalism}, year={2024}, month={Apr}, institution={Institute of Labor Economics (IZA)}, address={Bonn}, type={IZA Discussion Paper}, number={16947}, url={https://www.iza.org/index.php/publications/dp16947}, abstract={Is humanity's circle of moral concern expanding, as often claimed? I explore frequencies of morally universal language in 15m book publications in American English, British English, French, Spanish, German, and Italian from 1800-2000. In each language, morally universal terminology diminished substantially. I then test two prominent hypotheses predicting moral universalism: reason and religion. Reason-based terminology correlates positively with morally universal and morally communal terminology, explaining seemingly contradictory observations of the 20th century. In contrast, communal terminology sub-sides when religious terminology becomes more frequent. These empirical patterns cast doubt on prominent claims of moral universalism expanding.}, keywords={moral expansiveness;moral universalism;Expanding Circle;reason;religion}, }