Every weighted tree corresponds naturally to a cooperative game that we call a tree game; it assigns to each subset of leaves the sum of the weights of the minimal subtree spanned by those leaves. In the context of phylogenetic trees, the leaves are species and this assignment captures the...

Experimental evidence stresses the importance of so–called social preferences for understanding economic behavior. Social preferences are defined over the entire allocation in a given economic environment, and not just over one’s own consumption as is traditionally presumed. We study the...