of all Walrasian equilibrium allocations, the core, and the anonymous core of Hara (2002) are all empty. We also give an … equivalence theorem for the anonymous core when the preference relations may not be monotone. …

We consider information transmission in the core of an exchange economy with incomplete information by non … informational core. A coalition has an informational objection to the status-quo allocation if and only if there exists an … an allocation in the informational core. …

neither arbitrarily small coalitions nor large coalitions are enough to block an allocation which is not in the core, due to … the core provided by Vind and Schmeidler (1972) to economies with asymmetrically informed traders. We then focus on … information sharing rules based on the coalitions' size. Assuming the existence of coalitions to which the sharing rule associates …

is not necessary to consider the forma- tion of all coalitions in order to obtain the bargaining sets. This is shown …

timing of the coalitions of firms yield very di¤erent results on the set of allocations which are core-stable. We then … introduce the concept of core in games with externalities. We show that different assumptions on the behaviour as well as on the …

An evolutionary style model of recontracting is given which guarantees convergence to core allocations of an underlying …