Analysis of Marketing Margin and Efficiency to Enhance the Welfare of Argopuro Coffee Farmers in Jember Regency, Indonesia Dian Galuh Pratita, Apip Gunaldi Dalimunthe, Vivi Annisa International Journal of Agricultural Social Economics and Rural Development (Ijaserd) Vol. 5 No. 2 2026 DOI 10.37149/ijaserd.v5i2.2662