S. Gjerstad
Individual Rationality and Market Efficiency
Gjerstad, S.; Shachat, J.
Abstract
Smith’s (1962) demonstration that prices and allocations quickly converge to the competitive equilibrium in the continuous double auction (CDA) remains one of the most important results in experimental economics. Market experiments and exchange models have added considerably to our knowledge of how markets reach equilibrium, and how they respond to disruptions. Perhaps the best-known model of exchange in CDA market experiments is the random behavior “zero-intelligence” (ZI) model by Gode and Sunder (1993). They argue that the CDA generates efficient allocations and “convergence of transaction prices to the proximity of the theoretical equilibrium price,” provided only that agents meet their budget constraints. We demonstrate that prices do not converge in their simulations. Their budget constraint requires that a buyer’s currency never exceeds her commodity value, which is an unnatural restriction. Their conclusion that market efficiency results from the structure of the CDA independent of traders’ profit seeking behavior rests on their claim that the constraints that they impose are a part of the market institution. We show that actually they impose individual rationality. Misinterpretation of this behavioural constraint has lead to unproductive debate on market adjustment processes.
Citation
Gjerstad, S., & Shachat, J. (2021). Individual Rationality and Market Efficiency. Nonlinear Dynamics, Psychology, and Life Sciences, 25(4), 395-406
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 18, 2021 |
Publication Date | 2021-10 |
Deposit Date | Aug 26, 2021 |
Publicly Available Date | Aug 26, 2021 |
Journal | Nonlinear Dynamics, Psychology, and Life Sciences |
Print ISSN | 1090-0578 |
Publisher | Society for Chaos Theory in Psychology and Life Sciences |
Peer Reviewed | Peer Reviewed |
Volume | 25 |
Issue | 4 |
Pages | 395-406 |
Public URL | https://durham-repository.worktribe.com/output/1242189 |
Publisher URL | https://www.societyforchaostheory.org/ndpls/ |
Files
Accepted Journal Article
(450 Kb)
PDF
You might also like
Speed traps: algorithmic trader performance under alternative market balances and structures
(2023)
Journal Article
On the generalizability of using mobile devices to conduct economic experiments
(2023)
Journal Article
Arbitrage bots in experimental asset markets
(2022)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2025
Advanced Search