simultaneous R&D contests for complementary patents and how they interact with patent portfolios that firms may have acquired … already. We also consider how this interaction and the intensity of the contests depends on the type of patent trade regimes … multiple patent product involves an important hold-up problem that considerably reduces the overall contest effort. …

other with probabilistic success. The market structure results from stochastic innovation and patent litigation. Depending … the case of symmetric and asymmetric patent portfolios …