Simanjuntak, Loranty Folia, Joan Unedo Siregar, Teguh Aditya Wahyudi, Paloma Elisabeth KD, Rahayu Grasela Br Aritonang, and Benny sitorus. 2025. “Analysis of Coffee MSME Production Cost Efficiency Using the Leontief Matrix Model Based on Monthly Production Data at Sumatra Roastery in Medan City”. Outline Journal of Economic Studies 5 (2): 124-32. https://doi.org/10.61730/vegjaa70.