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Mass Economies With Vital Small Coalitions; The F-Core Approach, Peter J. Hammond, Mamoru Kaneko, Myrna Holtz Wooders

Cowles Foundation Discussion Papers

A mass-economy is one with many, many agents where each agent is negligible and each trading group is also negligible with respect to the mass-economy. Feasible allocations are those which are virtually attainable by trades only among members of coalitions contained in feasible (“measure-consistent”) partitions of the agent set. A feasible allocation is in the core, called the f -core, if it cannot be improved upon by any finite coalition. We show that in a private goods economy with indivisibilities and without externalities, the f -core, the A -core (Aumann’s core concept) and the Walrasian allocations coincide. In the presence …