We model constitutions by effectivity functions. We assume that the constitution is common knowledge among the members of the society. However, the preferences of the citizens are private information. We investigate whether there exist decision schemes (i.e., functions that map profiles of...

We study a model in which each of finitely many agent cares about a given subset of finitely many goods. We provide minimal conditions that ensure the existence and uniqueness of the equilibrium price vector - a price vector for which supply meets demand. Copyright Springer-Verlag...