InMorals by Agreement, David Gauthier (1986) argues that it is rational to intend to cooperate, even in single-play Prisoner's Dilemma games, provided (1) your co-player has a similar intention; (2) both intentions can be revealed to the other player. To this thesis four objections are made. (a) In a strategic decision the parameters on which the argument relies cannot be supposed to be given. (b) Of each pair ofa-symmetric intentions at least one is not rational. But it is impossible to (...) form symmetric intentions to cooperate conditionally. For the condition on which the decision depends cannot be fulfilled without deciding. (c) If one's intention has to be ascertained on the basis of information about one's past performance, it is straightforwardly rational to intend to cooperate, but there is no reason to do so in a single-play PD. (d) The argument cannot be extended ton-person games which are Gauthier's principal concern. (shrink)

Contemporary discussions about practical reason or practical rationality invoke four competing views which can be named as follows by reference to their historical models: Aristotelian, Hobbesian, Kantian and Nietzschean. The subject-matter of this article is a defence of the Kantian conception of practical rationality in the interpretation of discourse theory. At the heart, lies the justification and the application of the rules of discourse. An argument consisting of three parts is pre sented to justify the rules of discourse. The three (...) parts are as follows: a transcen dental-pragmatic argument; an argument which takes account of the maximisation of individual utility and an empirical premise about an interest in correctness. Within the framework of the problem of application, the article outlines a justification of human rights and of the basic institutions of the democratic constitutional state on the basis of discourse theory. (shrink)