Indonesian Market Concentration on The Non-Oil and Gas Commodity Before and During Covid-19 Pandemic. Signifikan: Jurnal Ilmu Ekonomi, [S. l.], v. 11, n. 2, p. 289–298, 2022. DOI: 10.15408/sjie.v11i2.24678. Disponível em: https://journal.uinjkt.ac.id/signifikan/article/view/24678. Acesso em: 15 jan. 2026.