The Effect of Leverage and Operational Cost Efficiency on Financial Performance with Firm Size as a Mediating Variable. Jelajah Ekonomi: Jurnal Ekonomi dan Bisnis Indonesia, [S. l.], v. 2, n. 1, p. 54–75, 2026. DOI: 10.65307/je.v2i1.305. Disponível em: https://publications.corejurnal.com/index.php/ekonomi/article/view/305. Acesso em: 4 nov. 2026.