Marketing of agricultural products is a managerial function which hitherto has not received the same emphasis as given to production. The fundamental elements of supply, demand and government intervention determine the policies and their trends. Even if all the possible information on factors that affect the price of grains were available, one farmer's interpretation of it is very likely to be different from that of another. This paper outlines the practical use of charting of prices, profitability and views about the future market conditions for effective market management. It illustrates their use in the market management of selling corn and soybeans in the USA.