“…While literature in IOp developed rapidly in various aspects over the last two decades, including the compensation principle (ex-ante vs. ex-post), reward principle (liberal vs. utilitarian), and measurement methodology (direct, indirect, stochastic dominance, and norm-based), etc. (Devooght, 2008;Lefranc et al, 2008;Ferreira & Gignoux, 2011;Roemer, 2012;Fleurbaey & Peragine, 2012;Ramos & Van de gaer, 2015;Brunori et al, 2018;Hufe et al, 2021), there has yet to focus on the differences among income sources, such as capital and labor income, to the best of our knowledge. We believe such distinguish is not only critical in income compositional inequality, as suggested by recent literature (Ranaldi, 2021;Ranaldi & Milanović, 2022), but also is essential in the estimation of IOp.…”