A massive study on the effects of social class tested 35 hypotheses in 4 countries (N = 33,536). Only 50% of prior findings replicated.

Hypotheses based on differences between social class contexts in terms of constraints, uncertainty and status were well supported across countries and measures.

\Hypotheses based on models positing social class differences in psychological orientations towards ‘the self’ versus ‘others and the environment’ received less support.

In short, the social psychology literature on social class did not replicate. The hypotheses about class from other fields largely held up. nature.com/articles/s41…