Across all model specifications, high-income individuals were more likely to donate their money and volunteer their time than low-income individuals; were more likely to engage in prosocial behavior under high (vs. low) income inequality

The Link Between Income, Income Inequality, and Prosocial Behavior Around the World - A Multiverse Approach. Lucía Macchia and Ashley V. Whillans. Social Psychology Vol. 52, No. 6, January 10, 2022 https://doi.org/10.1027/1864-9335/a000466

Abstract. The questions of whether high-income individuals are more prosocial than low-income individuals and whether income inequality moderates this effect have received extensive attention. We shed new light on this topic by analyzing a large-scale dataset with a representative sample of respondents from 133 countries (N = 948,837). We conduct a multiverse analysis with 30 statistical models: 15 models predicting the likelihood of donating money to charity and 15 models predicting the likelihood of volunteering time to an organization. Across all model specifications, high-income individuals were more likely to donate their money and volunteer their time than low-income individuals. High-income individuals were more likely to engage in prosocial behavior under high (vs. low) income inequality. Avenues for future research and potential mechanisms are discussed.

Check also Does economic inequality moderate the effect of class on prosocial behavior? A large-scale test of a recent hypothesis by Côté et al. Hagen von Hermanni, Andreas Tutic. PLOS, August 9, 2019. https://www.bipartisanalliance.com/2019/08/cote-et-al-argue-that-societies-with.html