Agnieszka Wiszniewska-Matyszkiel – Warsaw University, Poland
We analyse a linear quadratic multistage game of extraction of a common renewable resource--- a fishery---by many players with inherent linear state dependent constraints for exploitation and an infinite time horizon. We analyse the social optimum and Nash equilibrium for the feedback information structure and compare the results obtained in both cases. For the Nash equilibria, we obtain a value function that is contrary to intuitions from standard linear quadratic games. In our game, we face a situation in which the social optimum results in sustainability, while the Nash equilibrium leads to the depletion of the fishery in a finite time for realistic levels of the initial biomass of fish. Therefore, we also study an introduction of a tax in order to enforce socially optimal behaviour of the players. Besides, this game constitutes a counterexample to simplifications of techniques often used in computation of Nash equilibria and/or optimal control problems.
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