In this research article, we investigate the improved modelling ability and the outstanding policy advocacy of infusing health and education in sectoral growth equations of the South African economy. Our findings not only include improved and dependable modelling results but also provide distinct estimates of the returns on investment in health and education per sector using Iterative Seemingly Unrelated Regressions techniques. Additionally, this paper provides a theoretical description of the productivity effects of HIV/AIDS using sectoral equations. Also, this research investigates the diffusion process in the technological progress at the South African sectoral level and its impact on the study of social ingredients. Using a fixed effects model, some features of the diffusion process are explained.