1. Department of Rural Socio-Economics, College of Rural Development, Can Tho University, Can Tho, Vietnam
2. Laboratory of Environmental Economics, Division of International Agricultural Resource Economics and Business Administration, Department of Agricultural and Resource Economics, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
3. Department of Marketing, Sam M. Walton, College of Business, University of Arkansas, Fayetteville, AR, USA