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		| Christian  Wey  | 
	
	
		| Heinrich Heine University Düsseldorf | 
	
	
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		| Heinrich Heine University Düsseldorf | 
	
	
		| DICE | 
	
	
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		| Düsseldorf,  40225 | 
	
	
		| Germany | 
	
	
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		| wey@dice.hhu.de | 
	
	
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		JEL Areas: L1 : Market Structure, Firm Strategy, and Market Performance: General L4 : Antitrust Issues and Policies: General |