Alcalde Unzu, JorgeGallo, OihaneIñarra, ElenaMoreno Ternero, Juan D.2024-05-272024-05-272024Alcalde-Unzu, J., Gallo, O., Inarra, E., Moreno-Ternero, J. D. (2024) Solidarity to achieve stability. European Journal of Operational Research, 315(1), 368-377. https://doi.org/10.1016/j.ejor.2023.11.034.0377-221710.1016/j.ejor.2023.11.034https://academica-e.unavarra.es/handle/2454/48208Agents may form coalitions. Each coalition shares its endowment among its agents by applying a sharing rule. The sharing rule induces a coalition formation problem by assuming that agents rank coalitions according to the allocation they obtain in the corresponding sharing problem. We characterize the sharing rules that induce a class of stable coalition formation problems as those that satisfy a natural axiom that formalizes the principle of solidarity. Thus, solidarity becomes a sufficient condition to achieve stability.application/pdfeng© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.Coalition formationSharing ruleSolidarityStabilityinfo:eu-repo/semantics/article2024-05-27info:eu-repo/semantics/openAccess