Compositional game theory

Authors: Neil Ghani, Jules Hedges, Viktor Winschel and Philipp Zahn

Paper Information

Title:Compositional game theory
Authors:Neil Ghani, Jules Hedges, Viktor Winschel and Philipp Zahn
Proceedings:LICS PDF files
Editors: Anuj Dawar and Erich Grädel
Keywords:open games, game theory, monoidal categories, compositionality

ABSTRACT. We introduce open games as a compositional foundation of economic game theory. A compositional approach potentially allows methods of game theory and theoretical computer science to be applied to large-scale economic models for which standard economic tools are not practical. An open game represents a game played relative to an arbitrary environment and to this end we introduce the concept of coutility, which is the utility generated by an open game and returned to its environment. Open games are the morphisms of a symmetric monoidal category and can therefore be composed by categorical composition into sequential move games and by monoidal products into simultaneous move games. Open games can be represented by string diagrams which provide an intuitive but formal visualisation of the information flows. We show that a variety of games can be faithfully represented as open games in the sense of having the same Nash equilibria and off-equilibrium best responses.

Talk:Jul 09 15:20 (Session 49D)