Jörgen W. Weibull

Bio: Jörgen W. Weibull is an academic researcher from Stockholm School of Economics. The author has contributed to research in topics: Nash equilibrium & Game theory. The author has an hindex of 38, co-authored 171 publications receiving 10695 citations. Previous affiliations of Jörgen W. Weibull include Royal Institute of Technology & Research Institute of Industrial Economics.

Evolutionary Game Theory

Abstract: This text introduces current evolutionary game theory -- where ideas from evolutionary biology and rationalistic economics meet -- emphasizing the links between static and dynamic approaches and noncooperative game theory. Much of the text is devoted to the key concepts of evolutionary stability and replicator dynamics. The former highlights the role of mutations and the latter the mechanisms of selection. Moreover, set-valued static and dynamic stability concepts, as well as processes of social evolution, are discussed. Separate background chapters are devoted to noncooperative game theory and the theory of ordinary differential equations. There are examples throughout as well as individual chapter summaries. Because evolutionary game theory is a fast-moving field that is itself branching out and rapidly evolving, Jorgen Weibull has judiciously focused on clarifying and explaining core elements of the theory in an up-to-date, comprehensive, and self-contained treatment. The result is a text for second-year graduate students in economic theory, other social sciences, and evolutionary biology. The book goes beyond filling the gap between texts by Maynard-Smith and Hofbauer and Sigmund that are currently being used in the field. Evolutionary Game Theory will also serve as an introduction for those embarking on research in this area as well as a reference for those already familiar with the field. Weibull provides an overview of the developments that have taken place in this branch of game theory, discusses the mathematical tools needed to understand the area, describes both the motivation and intuition for the concepts involved, and explains why and how it is relevant to economics.

Balanced-budget redistribution as the outcome of political competition

Abstract: This paper models balanced-budget redistribution between socio-economic groups as the outcome of electoral competition between two political parties. Equilibrium is unique in the present model, and a sufficient condition for existence is given, requiring that there be enough ‘stochastic heterogeneity’ with respect to party preferences in the electorate. The validity of Hotelling's ‘principle of minimum differentiation’, and of ‘Director's Law’, are examined under alternative hypotheses concerning administrative costs of redistributions, and voter's possibilities both of abstaining from voting and of becoming campaign activists for one of the parties. The policy strategy of expected-plurality maximization is contrasted with the strategy of maximizing the probability of gaining a plurality. Incomes are fixed and known, so lump-sum taxation is feasible. However, constraints on tax/transfer differentiation between individuals are permitted in the analysis.

Social Norms and Economic Incentives in the Welfare State

Abstract: This paper analyzes the interplay between social norms and economic incentives in the context of work decisions in the modern welfare state. We assume that to live off one's own work is a social no ...

Evolutionary Game Theory

Abstract: This text introduces current evolutionary game theory--where ideas from evolutionary biology and rationalistic economics meet--emphasizing the links between static and dynamic approaches and noncooperative game theory. The author provides an overview of the developments that have taken place in this branch of game theory, discusses the mathematical tools needed to understand the area, describes both the motivation and intuition for the concepts involved, and explains why and how the theory is relevant to economics.

Time Discounting and Time Preference: A Critical Review

Abstract: This paper discusses the discounted utility (DU) model: its historical development, underlying assumptions, and "anomalies" - the empirical regularities that are inconsistent with its theoretical predictions. We then summarize the alternate theoretical formulations that have been advanced to address these anomalies. We also review three decades of empirical research on intertemporal choice, and discuss reasons for the spectacular variation in implicit discount rates across studies. Throughout the paper, we stress the importance of distinguishing time preference, per se, from many other considerations that also influence intertemporal choices.

Evolutionary games and population dynamics

Abstract: Every form of behavior is shaped by trial and error. Such stepwise adaptation can occur through individual learning or through natural selection, the basis of evolution. Since the work of Maynard Smith and others, it has been realized how game theory can model this process. Evolutionary game theory replaces the static solutions of classical game theory by a dynamical approach centered not on the concept of rational players but on the population dynamics of behavioral programs. In this book the authors investigate the nonlinear dynamics of the self-regulation of social and economic behavior, and of the closely related interactions among species in ecological communities. Replicator equations describe how successful strategies spread and thereby create new conditions that can alter the basis of their success, i.e., to enable us to understand the strategic and genetic foundations of the endless chronicle of invasions and extinctions that punctuate evolution. In short, evolutionary game theory describes when to escalate a conflict, how to elicit cooperation, why to expect a balance of the sexes, and how to understand natural selection in mathematical terms. Comprehensive treatment of ecological and game theoretic dynamics Invasion dynamics and permanence as key concepts Explanation in terms of games of things like competition between species