Core

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A core is the set of feasible allocations in an economy that cannot be improved upon by subset of the set of the economys consumers (a coalition). A coalition is said to improve upon or block a feasible allocation if the members of that coalition are better off under a different feasible allocation that is identical to the first except that every member of the coalition has a different consumption bundle that is part of an aggregate consumption bundle that can be constructed from publicly available technology and the initial endowments of each consumer in the coalition.