Moral Foundations Theory Across 28 Nations: Cross-Cultural Variation in Harm, Fairness, Loyalty, Authority, and Purity Foundations and Their Association With Political Orientation

This study investigates cross-national variation in moral foundations theory subscales (Harm, Fairness, Loyalty, Authority, Purity) across 28 countries and their differential associations with political orientation across cultural contexts within the context of cross-cultural psychology and moral cognition, an area of growing scientific importance given its implications for cross-cultural moral psychology theory refinement, international political communication strategy, and cross-cultural survey instrument harmonization methodology. Using nationally representative samples via stratified quota sampling and online panels (Kantar) in 28 countries, MFQ-30 scored and harmonized across languages, multilevel regression with country as random effect and Hofstede cultural dimensions as moderators, we examine moral foundations reflecting both universal psychological mechanisms (Harm, Fairness) and culturally elaborated binding foundations (Loyalty, Authority, Purity) that differ in endorsement across individualist-collectivist and tight-loose cultural dimensions, with binding foundations more strongly correlating with conservative political orientation across cultures in 56,840 adults across 28 countries (mean n=2,030/country, age 18-75, 50% female target), translated MFQ-30 with IRT-verified item equivalence across 24 language versions drawn from 28 countries spanning Western Europe (n=10), North America (n=2), Latin America (n=5), East Asia (n=4), South Asia (n=3), sub-Saharan Africa (n=4) with stratified national quota sampling. Results indicate that Harm and Fairness foundations show highest universality (cross-national SD 0.28/0.32) while Purity shows highest cross-national variation (SD 0.84); Purity foundation endorsement is 2.4x higher in collectivist vs. individualist countries; all binding foundations (Loyalty, Authority, Purity) correlate with conservative orientation across cultures but r is 2.1x stronger in collectivist contexts (p < 0.001), with Purity SD 0.84 highest cross-national variation; 2.4x higher in collectivist nations; binding foundation conservatism r 2.1x in collectivist contexts as the primary quantitative benchmark. Concordance between primary and confirmatory measurement approaches exceeded 93%, validating the analytical framework. These findings contribute empirically to cross-cultural psychology and moral cognition and carry actionable implications for the design of programs and policies targeting cross-cultural moral psychology theory refinement, international political communication strategy, and cross-cultural survey instrument harmonization methodology.