*Le Canh Bich Tho¹, Chieko Umetsu² (1. Department of Business Administration, FPT University - Can Tho Campus, Vietnam, 2. Division of Natural Resource Economics, Graduate School of Agriculture, Kyoto University, Japan )

*Akari Hoshino¹, Akihiko Sakashita² (1. Graduate School of Agriculture, Hokkaido University, 2. Hokkaido Research Institute of Agriculture)

*Yuki Sano¹, Hiroe Ishihara², Jos Verstegen³ (1. Institute for Future Initiatives, the University of Tokyo, 2. Graduate School of Frontier Sciences, The University of Tokyo, 3. Wageningen Economic Research, Wageningen University and Research)