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		| Marvin  Kraus | 
	
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		| ''A generalized envelope theorem with an application to congestion-prone facilities'' | 
	
		| ( 2002, Vol. 3 No.28 ) | 
	
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		| A generalized envelope theorem is presented which has the Envelope Theorem as a special case.  Relative to the Envelope Theorem, it provides greater flexibility in determining the rate of change of a value function with respect to one of its arguments.  We revisit a classic result on economies of scale for a congestion-prone facility, using the flexibility of the Generalized Envelope Theorem to provide a simpler, more intuitive proof. | 
	
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		| Keywords: congestible facilities | 
	
		| JEL: C6 - Mathematical Methods and Programming: General 
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		| | Manuscript Received : Dec 04 2002 |  | Manuscript Accepted : Dec 04 2002 | 
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