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		| Hammoudi  Abdelhakim and Giraud-héraud  Eric | 
	
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		| ''On the Existence and uniqueness of Price Equilibrium with Multi-Store Firms'' | 
	
		| ( 2009, Vol. 29 No.2 ) | 
	
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		| The paper gives a proof of the existence and the uniqueness of price equilibrium in a multi-product, multi-firm competition framework. It illustrates how the price levels depends on the inter-brand portfolio substitution and on the intra-brand portfolio substitution | 
	
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		| Keywords: | 
	
		| JEL: L1 - Market Structure, Firm Strategy, and Market Performance: General
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		| | Manuscript Received : Dec 23 2008 |  | Manuscript Accepted : May 06 2009 | 
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