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		| Bocar Samba Ba  | 
	
	
		| Université Clermont Auvergne, CNRS, CERDI, F-63000 Clermont-Ferrand, France | 
	
	
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		| 29, rue de la Liève | 
	
	
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		| Clermont-Ferrand, Auvergne 63100 | 
	
	
		| France | 
	
	
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		| bocar_samba.ba@uca.fr | 
	
	
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		JEL Areas: Q5 : Environmental Economics: General H2 : Taxation, Subsidies, and Revenue: General |