This paper investigates the endogenous choice between price- and quantity-setting behaviour in a duopoly game where firms invest in product development first, and then play a marketing game later. Only in the initial R&D stage, the two firms set up a joint venture in order to share the costs of...

We characterize the interplay between firm's decisions in product development, be it joint or independent, and their ensuing repeated price behaviour, either collusive or Bertrand-Nash. We prove that joint-product development and the resulting lack of horizontal differentiation may destabilise...