Muhammad Iqbal and Mitra Musika Lubis 2025. Analysis of the People’s Rubber Marketing System in Mandailing Natal: Review of Distribution Channels, Margins, and Efficiency. International Journal of Health, Economics, and Social Sciences (IJHESS). 7, 3 (Jul. 2025), 1566~1570. DOI:https://doi.org/10.56338/ijhess.v7i3.8329.