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Robin Neill cites Marshall's three-fold discussion of production in the  
context of reducing the exogenous variables. I prefer Frank Knight's  
critique of Marshall (arguing that he is ambiguous on several issues), in  
"Cost of Production and Price Over Long and  Short Periods."   JPE  
29 (April 1921): 304-35.   
 
Knight's work in Risk, Uncertainty and Profit and some of his early  
articles deal with the issue of what a market is in a form Alan may find  
useful. Check also "Statics and Dynamics" published first in German in  
1930 and then in English in Ethics of Competition in 1935. 
 
Ross Emmett   
 
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