Sharing a resource with concave benefits

A group of agents are collectively entitled to a perfectly divisible good or resource. They enjoy concave and satiable benefit functions from consuming it. They also value money (transfers). The resource is scarce in the sense that not everybody can consume its satiated consumption level. This paper characterizes the unique (resource and money) allocation that is efficient, incentive-compatible and equal-sharing individual rational. It then discusses its implementation and its link with other axioms.