This paper investigates a class of two-period games in which the first-period interactions have the features of a prisoner’s dilemma game and the second-period interactions have the features of a coordination game. This class of games seems relevant to problems of industrial organization where firms not only compete in prices but also have to coordinate in some other dimensions. We find that eq...

Kohlberg and Mertens (1986) argued that a solution concept to a game should be invariant under the addition or deletion of an equivalent strategy and not require the use of weakly dominated strategies. In this paper we study which of these requirements are satisfied by Kalai and Samet’s (1984) concepts of persistent equilibria and persistent retracts. While none of these concepts has all the in...

We present a treatment for mathematical economists of three topics in the theory of xed points: (a) the Lefschetz xed point index; (b) the Lefschetz xed point theorem; (c) the theory of essential sets of xed points. Our treatment is geometric, based on elementary techniques, and largely selfcontained. In particular there is no essential reference to algebraic topology. Within the chosen scope o...

I consider n–person normal form games where the strategy set of every player is a non–empty compact convex subset of Euclidean space, and the payoff function of player i is continuous and concave in player i’s own strategies. No further restrictions (such as multilinearity of the payoff functions or the requirement that the strategy sets be polyhedral) are imposed. In this setting we demonstrat...

In a repeated zero-sum two-person game with incomplete information on both sides, the asymptotic value is defined as v = lim_oo v", where vn is the value of the game with n repetitions. It is shown here that v may be a transcendental number even for games in which all parameters defining the game are rational. This is in contrast to the situation in stochastic games where by the result of Bewle...

Allen H. Hurlbert* and Ethan P. White Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA *Correspondence: E-mail: [email protected] Present address: Ethan P. White, Department of Biology, Utah State University, 5305 Old Main Hill, Logan, UT 84322, USA Abstract Species richness patterns are characterized either by overlaying species range maps or by compiling geographical...

Cette recherche a pour objet les discussions philosophiques sur des dilemmes moraux avec adultes détenus. Le dilemme moral est une situation fictive ou réelle dont l’issue pose un problème de choix restreint entre deux possibilités contradictoires. De fait, le fait l’objet controverses participants aux philosophiques. Notre s’intéresse à l’éducation incarcérés afin participer leur développement...