Mulyono, S., Kaswoto, J., Rahmiyanti, S., Octasylva, A. R. P., Prasetyo, F. M., & Sudarmanto, E. (2026). The Influence of Transaction Costs and Opportunistic Behavior on MSME Sustainability through Operational Efficiency in Indonesia. The Es Economics and Entrepreneurship, 4(03), 380 – 392. https://doi.org/10.58812/esee.v4i03.979