With (a) an increasing role the concept of “Sufficiency Economy” plays in sustainable development, (b) its potential to effectively deal with wicked sustainability problems and (c) our limited knowledge about the relevant collective knowledge scholars have created, the present study reviews all related peer-review journal articles during the past 66 years (1957-2023) in the Scopus database by adopting the author citation and co-citation analyses to identify four schools of thought, and their leading scholars in the knowledge domain. Systematically, the most influential scholar is identified, whose collective body of knowledge is used as the basis to develop a Sufficiency Economy for Business Sustainability model as the frontier knowledge. Policy and managerial implications are also drawn from the model. Finally, drawing upon the analyses, informed future research directions have been discussed.