The article examines Japan's trade agreements with other Asian countries using a complex model. They looked at different scenarios involving trade deals and how factors like labor movement and technology flow impact these agreements. The research found that Japan’s shift to regional agreements has both positive and negative effects. It suggests that simply opening up trade might not always be the best move for Japan's overall well-being. The study provides insights into how these agreements affect Japan and other Asian nations, offering new perspectives on the benefits and drawbacks of these trade deals.