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[Responding to J. Barkley Rosser's posting:] 
 
I don't understand your distinction. Surely for an economist it is 
only the utility that matters. There are both positive and negative 
externalities associated with eating. (Think of your grandmother making 
cookies for you when you were a child.)  True the other does not gain 
utility (or disutility) in the same manner, but there is a joint 
consumption. 
 
Rod Hay 
 
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