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		| Charles  Figuières and Magali  Verdonck | 
	
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		| ''On the Core of an Economy with Multilateral and Multidimensional Environmental Externalities'' | 
	
		| ( 2003, Vol. 3 No.3 ) | 
	
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		| For simple economic models of transfrontier pollution, Chander and Tulkens (1995) and (1997) have offered a formula for transfers to sustain international cooperation on a voluntary basis and which deter coalitionnal free-riding under some reasonable behaviours of countries not in the coalition. Their scheme rests on the assumption that pollution is a scalar. Relaxing this assumption, interesting interactions among pollutants arise that call for a new formula. In this paper we extend Chander and Tulkens formula for this more realistic multidimensional context, and thereby enhance the pratical and theoretical relevance of their seminal analysis. | 
	
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		| Keywords: core | 
	
		| JEL: H7 - State and Local Government; Intergovernmental Relations: General
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		| | Manuscript Received : Mar 07 2003 |  | Manuscript Accepted : Mar 08 2003 | 
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