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