摘要：We investigate the market and firm-specific factors that may impact firms’ product choices in the U.S. biotech corn seed market. Specifically, we estimate how the competition effects, the conglomeration effect, the similarity effect, and other market shifters influence firms’ variety choices under imperfect competition. In addition, we examine and compare such responses among different types of firms, including integrated biotech firms versus seed companies, and the incumbent firms versus the entrant firms.
