In this paper we introduce a new concept of solidarity in terms of reciprocity and characterize the set of social choice functions that are reciprocate (in both a strong and a weak sense), anonymous and efficient in a standard public good provision model when the agents have single-peaked preferences on the amount of the good provided. The resulting procedures are the well-known Generalized Condorcet Winner Solutions, and therefore, we provide an alternative characterization of that class of social choice functions based in new ethical properties regarding solidarity.
Single-peaked preferences, solidarity, welfare domination under preference replacement.
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