Barley can be differentiated into feed and malting barley based on its end-use markets. Substitutability both in supply and in demand complicates analysis of price information in the barley market. The paper examines the price linkages between feed and malting barley in the Queensland barley market by using cointegration and error correction models. Malting barley prices respond to restore equilibrium relationships with corresponding feed barley prices in the long run, but not vice versa. Thus there appears to be a price leadership role for feed barley, and one-way substitutability and quality differences in the barley market.