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		| First Author:
 
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		| Valerie  Mignon | 
	
		| EconomiX-CNRS, University of Paris Ouest and CEPII | 
	
		| valerie.mignon@u-paris10.fr | 
	
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		| Second Author: 
 
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		| Emmanuel  Dubois | 
	
		| PESOR, University of Paris XI | 
	
		| emmanuel.dubois@u-psud.fr | 
	
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		| Third Author: 
 
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		| Jerome  Hericourt | 
	
		| EQUIPPE, University of Lille and CES, University of Paris 1 | 
	
		| jerome.hericourt@univ-paris1.fr | 
	
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