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		| Nicolas  Houy | 
	
	
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		| ''Are better vaccines really better? The case of a simple stochastic epidemic SIR model'' | 
	
	
		| ( 2013, Vol. 33 No.1 ) | 
	
	
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		| We consider a model of vaccine market where the buyer is centralized and shows an endogenous demand function based on a simple stochastic SIR model. When the seller is a monopoly, we show that better vaccines (in the sense of greater efficiency or inducing less side-effects) do not imply greater total surplus, greater buyer surplus or even greater profits. Since we consider a centralized buyer, our results cannot be caused by the well-known epidemiological externality of vaccination. | 
	
	
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		| Keywords: Vaccines,  Market structure,  Monopoly,  Epidemiology,  SIR model. | 
	
	
		JEL: I1 - Health: General
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		| Manuscript Received : Jan 11 2013 |   | Manuscript Accepted : Jan 23 2013 |  
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