On Monday, October 20, 2025, the Doctoral Program in Economics with a concentration in Sustainable Development at Trisakti University successfully held the Promotion Session for Dr. Bambang Patijaya and the Promovendus graduated with honors. The theme of his research is related to the Development of a Tin Trade System Model. The results of this research will be a very useful contribution to the development of the Tin Trade System, which will ultimately increase the country’s economic income, related to the tin trade system. Once again, congratulations to Dr. Bambang Patijaya for his achievements, and do not stop providing benefits and contributions of ideas, knowledge and innovation to the nation and state. Please click below to view the Promotion Session for Dr. Bambang Patijaya.