Portfolio Considerations in Differentiated Product Purchases: An Application to the Japanese Automobile Market Staff Working Paper 2011-27 Naoki Wakamori Consumers often purchase more than one differentiated product, assembling a portfolio, which might potentially affect substitution patterns of demand and, as a consequence, oligopolistic firms’ pricing strategies. Content Type(s): Staff research, Staff working papers Topic(s): Economic models, Market structure and pricing JEL Code(s): D, D4, L, L5, Q, Q5