Lambertini, Luca; Mantovani, Andrea - In: International Journal of Industrial Organization 27 (2009) 4, pp. 508-518
We adopt a dynamic approach to model the behaviour of a multiproduct monopolist investing in process innovation, and either product differentiation, or product proliferation, or both. Irrespective of the number of activities appearing in the R&D portfolio, we prove that, depending on initial...