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It is my understanding (sorry, I don't have a handy dandy source for this) 
that Marshall's (following Fleeming Jenkin) approach was motivated by what 
went on (goes on) in what was without question the single most important 
market at that time for the quality of most peoples' lives, the market for 
bread.  In that market, quantity has a strong exogenous element due to 
weather. So, one can think of weather determining quantity with price 
adjusting as the dependent variable. 
 
Barkley Rosser 
 
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