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. This paper studies such consumers' portfolio considerations by developing a...

The present study aimed to investigate the effect of market structure and risk taking on the efficiency of banks accepted in Tehran Stock Exchange. This study was an applied research and all the banks accepted in Tehran Stock Exchange participated in the study and among them, 10 banks were...