================= HES POSTING ================= 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 ============ FOOTER TO HES POSTING ============ For information, send the message "info HES" to [log in to unmask]