Belief-based refinements in signalling games
There are many economic problems which, when modelled as games of incomplete information, give rise to many sequential equilibria, severely limiting the usefulness of the model. There has recently been a large literature devoted to ``refining'' the set of equilibria in order to reduce this multiplicity by restricting the set of admissible disequilibrium beliefs. This paper argues that the logical foundations of some refinements and the equilibria they focus on are problematic and, further, proposes an alternative refinement, undefeated equilibrium, that avoids the difficulties. We also provide an existence theorem covering a broad class of signalling games often studied in economics.
scientific article; zbMATH DE number 465074