This document discusses marketing costs and methods for estimating them. It defines key terms like marketing margins, price spread, and producer's share. It outlines three methods for estimating marketing costs: lot method, sum of average gross margins method, and comparison of prices at successive levels. Factors that affect marketing costs are also presented, like perishability, bulkiness, storage needs, and number of intermediaries involved. Agricultural product marketing costs are generally higher than other products due to issues like small farm size, grading challenges, and irregular supply.