Reassessing the economic returns of diverse traditional agricultural systems for smallholder farmers: a case study of the milpa in Mexico - Julio Díaz-José; Rogelio Limón-Rivera; Otto R. Leyva-Ovalle; Leticia Myriam Sagarnaga-Villegas; Gregorio Briones-Ruiz; A. Carolina Elizondo-Salas; Hilario García-Martínez; Susana I. Castillo-Martínez; Pablo Andrés-Meza; Oscar Díaz-José; Francisco Guevara-Hernández; Mauricio R. Bellon (Agricultural Systems, 2026)