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		| Juan manuel  Sánchez-cartas  | 
	
	
		| Universidad Politécnica de Madrid | 
	
	
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		| UPM Campus de Montegancedo | 
	
	
		| Pozuelo de Alarcón | 
	
	
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		| Madrid,  28223 | 
	
	
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		| juanmanuel.sanchez@upm.es | 
	
	
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		JEL Areas: L1 : Market Structure, Firm Strategy, and Market Performance: General D2 : Production and Organizations: General |