The purpose of this research is to analyze the differences in the income of rubber farmers who join and do not join UPPB Maju Tani in Tanjung Bulan Village, Rambang Kuang District, Ogan Ilir Regency, to analyze what are the determinants that influence the decisions of rubber farmers to join and not join as members of UPPB Maju Tani, and identify the biggest reasons for rubber farmers joining an…