TAKAYUKI YAMASHITA is a Professor of Economics at Aoyama Gakuin University. He is the author of articles on Industrial Organization and Regional Economics. In several articles, he analyzes the impact of exchange rate changes on competition among domestic retailers or manufacturers. He serves as vice president and editorial board chair of the Japan Chapter of the System Dynamics Society and previously served on the board of directors of the Japan Economic Policy Association. TAMAKI MORITA is a Professor of Economics in the Faculty of Aviation Management at J. F. Oberlin University. She is an interdisciplinary applied economist whose research bridges macroeconomic growth theory and micro-level analysis, investigating subjective well-being, resource allocation, education, and the evolving role of artificial intelligence (AI). Her work contributes to empirically grounded approaches to economic policy that enhance social welfare.