The paper compares two models of evolution in symmetric twoplayergames with incomplete information. One model postulates thatthe type of a player is fixed, and evolution works within types. Inthe other model type-contingent strategies evolve. In the case of twotypes and two strategies it is...

In the context of international bargaining, standard models predict that a shift in military power can cause preventive war because it changes the relative bargaining position between states. We find that shifts in military power are not the only cause of war under commitment problems and that...

With respect to the labor market participation of the elderly in welfare states, the economic literature focuses on the incentives to the worker in the light of generous early retirement opportunities. The sociological literature on the other hand addresses the problem of low productivity of...