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		| Camilla  Di Luca, Josep M  Izquierdo and Carles  Rafels | 
	
	
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		| ''Remarks on the proportional distribution in increasing return to scale problems'' | 
	
	
		| ( 2013, Vol. 33 No.4 ) | 
	
	
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		| We study a cooperative problem where agents contribute a certain amount of input  in order to obtain a surplus. We assume that the average surplus with respect to the amount contributed is increasing. Within this basic model, a cooperative game is associated and  the proportional distribution arises as a natural core allocation. We describe a necessary and sufficient condition for which the core of the game shrinks to the proportional distribution. Furthermore, we characterize axiomatically the proportional distribution by means of three properties: core-selection, core-invariance and  resource monotonicity. Finally, we provide a condition that guarantees that the proportional nucleolus coincides with the proportional solution. | 
	
	
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		| Keywords: cooperative game,  proportional distribution,  core,  nucleolus | 
	
	
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		| Manuscript Received : Jun 21 2013 |   | Manuscript Accepted : Dec 23 2013 |  
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