We develop a model of endogenous network formation in order to examine the incentives for R&D collaboration in a mixed oligopoly. Our analysis reveals that the complete network, where each firm collaborates with all others, is uniquely stable. When R&D subsidies are not available, in addition to the complete network, the private partial and the private-hub star networks are Pareto efficient. However, the complete network becomes the unique Pareto efficient network when R&D is subsidized. This result is in contrast with earlier contributions in private oligopoly where under strong market rivalry a conflict between stable and efficient networks is likely to occur. It also highlights the role of a public firm as policy instrument in aligning individual incentives for collaboration with the objective of efficiency, independently of whether R&D subsidies are provided by the regulator.
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