Hostname: page-component-89b8bd64d-x2lbr Total loading time: 0 Render date: 2026-05-07T04:20:14.716Z Has data issue: false hasContentIssue false

Regular Quantal Response Equilibrium

Published online by Cambridge University Press:  14 March 2025

Jacob K. Goeree
Affiliation:
Division of the Humanities and Social Sciences, California Institute of Technology, Mail code 228-77, Pasadena, CA 91125, USA
Charles A. Holt
Affiliation:
Department of Economics, University of Virginia, Charlottesville, VA 22904-4182, USA
Thomas R. Palfrey
Affiliation:
Department of Economics, Princeton University, 112 Fisher Hall, Princeton, NJ 08540, USA

Abstract

The structural Quantal Response Equilibrium (QRE) generalizes the Nash equilibrium by augmenting payoffs with random elements that are not removed in some limit. This approach has been widely used both as a theoretical framework to study comparative statics of games and as an econometric framework to analyze experimental and field data. The framework of structural QRE is flexible: it can be applied to arbitrary finite games and incorporate very general error structures. Restrictions on the error structure are needed, however, to place testable restrictions on the data (Haile et al., 2004). This paper proposes a reduced-form approach, based on quantal response functions that replace the best-response functions underlying the Nash equilibrium. We define a regular QRE as a fixed point of quantal response functions that satisfies four axioms: continuity, interiority, responsiveness, and monotonicity. We show that these conditions are not vacuous and demonstrate with an example that they imply economically sensible restrictions on data consistent with laboratory observations. The reduced-form approach allows for a richer set of regular quantal response functions, which has proven useful for estimation purposes.

Information

Type
Research Article
Copyright
Copyright © 2005 Economic Science Association

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable