SIMANJUNTAK, Loranty Folia; SIREGAR, Joan Unedo; WAHYUDI, Teguh Aditya; KD, Paloma Elisabeth; ARITONANG, Rahayu Grasela Br; SITORUS, Benny. 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, [S. l.], v. 5, n. 2, p. 124–132, 2025. DOI: 10.61730/vegjaa70. Disponível em: https://www.journal.outlinepublisher.com/index.php/OJES/article/view/650. Acesso em: 16 apr. 2026.