Prof. YEUNG Wing Kay, DavidDavidProf. YEUNG Wing KayPetrosyan, Leon A.Leon A.PetrosyanZhang, Ying-XuanYing-XuanZhang2026-07-202026-07-202026Journal of the Operations Research Society of China, 2026.2194-668X2194-6698http://hdl.handle.net/20.500.11861/28268This technical note develops a complementary cooperative solution to the dynamic network game of the Fintech industry of Yeung et al. (J Oper Res Soc China. 12: 5–33, 2024). The solution satisfies the properties of individual rationality, group optimality, time consistency, and the fair gain-sharing principle. It entails two advantageous attributes over those of the Shapley value, including a gain-sharing principle based on the contributions of firms and a much simpler solution mechanism.enCooperative Dynamic GamesPareto Efficient CooperationMarginal ContributionsFair Gain-SharingPeer Reviewed Journal Article10.1007/s40305-026-00699-z