If a trait is sufficiently important that it appears in the lexicon of most human languages, then that trait demonstrates the concept of cross-cultural universality.
Kohlberg implies that "there is a cross-cultural universality of moral or ethical development. The hypothesis claims are identified as culturally vast, universal and moral questions, invariant stage sequence, wide range of stages, and general applicability of the stages".
"The study of cultural universals is scientifically important because they tells us about 'the psychic unity of mankind,' the principle that states that the humans in every population around the globe have basically the same propensities, abilities and same basic human psychic behavior". Cross-cultural universality is for social-moral developmental knowledge and co- existent.
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