%0 Journal Article %A Alcalde-Unzu, Jorge %A Gallo, Oihane %A IƱarra, Elena %A Moreno-Ternero, Juan D. %T Solidarity to achieve stability %D 2024 %U https://hdl.handle.net/10433/20411 %X Agents 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. %K Solidarity %K Stability %K Coalition formation %K Sharing rule %~