Chanpala, P. .; Boonklin, W. .; Seethong, P. .; Ngamkhum, T. .; Suriyasarn, T. . THE DEVELOPMENT OF A SUPPLEMENTARY CURRICULUM BASED ON PROBLEM-BASED LEARNING TO ENHANCE FINANCIAL LITERACY SKILLS FOR SECONDARY SCHOOL YOUTH IN LAMPANG PROVINCE. JMND 2025, 12, 192-202.