The objectives of this study were: (1) Analyzing the differences in the income of smallholder rubber farmers who join and do not join UPPB Maju Bersama in Marga Tunggal Village, Jayaloka District, Musi Rawas Regency. (2) Analyzing the factors that influence smallholder rubber farmers to join or not join UPPB Maju Bersama in Marga Tunggal Village, Jayaloka District, Musi Rawas Regency. (3) Ident…