or positive effects on R&D-investment, respectively. Both possibilities arise in plausible situations, even if one uses … on investment more likely. Extending the basic framework, the paper shows that separation of ownership and control …, endogenous entry and cumulative investments make positive effects of competition on investment more likely. Imperfect upstream …

We examine cost-reducing investment in vertically-related oligopolies, where firms may be vertically integrated or …. (ii) Vertical integration increases own investment and decreases competitor investment. (iii) Firms may integrate …

quality. Under reasonable assumptions on demand, investment incentives turn out to be smaller under vertical separation than … market can sometimes improve incentives. With suitable non-linear access prices investment incentives under separation become … identical to those under integration. -- investment incentives ; networks ; quality ; vertical externality …