Excerpt: This paper attempts to bring together a number of studies, made by the writer during the past three or four years, which have boon of practical use in anticipating changes in prices, marketings, and subsequent farm production. They are an outgrowth of the price analysis work sponsored by the Bureau of Agricultural Economics in its attempts to supply farmers with outlook information relative to prospective changes in supply and demand conditions. The topics covered in this paper are: (1) A simple illustration of an approach to the instantaneous supply and demand curves for commodities of fixed annual supply. The supply curves dealt with here are the current supply curves representing supplies offered from a total fixed available quantity on hand. (2) Relations between producer, dealer and total demand curves and two views of price determination. (3) Shifts in demand curves, that involve changes in slope (of elasticity) and changes in level due to the value of money, population growth, etc. (4) Comparison of agricultural with nonagricultural demand curves. (5) Subsequent-supply curves which show the effect of current prices on supplies of the following season or seasons.