Akbar Nusantara, Sandy, and Raden Aswin Rahadi. “From Leaf to Extract: A Cost-Benefit and Input-Output Assessment of Kratom Down Streaming in Indonesia”. Journal Research of Social Science, Economics, and Management, vol. 5, no. 12, June 2026, pp. 12891-9, doi:10.59141/jrssem.v5i12.1529.