Nabilla, H., Nugroho, A. A. and Saputra, D. (2026) “The Influence of Tin Prices and Production Costs on the Net Profit Margin of PT Timah Tbk with Exchange Rate as a Moderating Variable (2018–2025)”, Advances in Economics & Financial Studies, 4(3), pp. 412–430. doi: 10.60079/aefs.v4i3.1033.