“…Recently, to support policy-makers to build good contract from the farmers' point of view, choice experiment (CE) method has been used to explore farmers' preferences for the contracts (Abebe et al, 2013;Blandon et al, 2009;Broch et al, 2013;Christensen et al, 2011;Espinosa-Goded et al, 2010;Gelaw et al, 2016;Lemeilleur et al, 2020;Ochieng et al, 2017;Schipmann and Qaim, 2011;Van den Broeck et al, 2017;Vassalos et al, 2016;Villanueva et al, 2017). However, there are limited studies research on the contract focusing on sustainable certification.…”