Sandi Abdi JJ Pamungkas, Haryadi and Etik Umiyati (2024) “Effect of investment, unemployment, and human development index against income inequality (Comparative study of Java Island, Sumatra, and Sulawesi Island)”, The Asian Journal of Professional & Business Studies, 5(1), pp. 99–114. doi: 10.61688/ajpbs.v5i1.306.