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Is individual rationality essential to market price formation? The contribution of zero‐intelligence agent trading models

Is individual rationality essential to market price formation? The contribution of zero‐intelligence agent trading models

Tubaro, Paola (2009) Is individual rationality essential to market price formation? The contribution of zero‐intelligence agent trading models. Journal of Economic Methodology, 16 (1). pp. 1-19. ISSN 1350-178X (Print), 1469-9427 (Online) (doi:https://doi.org/10.1080/13501780802225528)

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Abstract

The paper investigates the minimum level of individual rationality that is needed for market prices to converge toward their equilibrium level. It does so by examining the theoretical and methodological foundations of the ‘zerointelligence’ (ZI) agent trading approach, with which Gode and Sunder (1993a) claimed that weak individual rationality requirements suffice to obtain equilibrium prices. The paper shows that ZI agents are endowed with a higher degree of rationality than previously believed. Though not maximizing utility, they exhibit utility-improving behavior, and their decision-making rules fulfill important predictions of the theory of choice based on maximization, namely downward-sloping individual demand and upward-sloping individual supply.

Additional cognitive skills would be required, were some simplifying assumptions of the basic model removed. Gode and Sunder’s analysis supports a nonneoclassical rational choice theory, in which optimization can be replaced by a variety of behavioral rules, while still preserving mportant results on the functioning of markets.

Item Type: Article
Additional Information: [1] First published: 2009. [2] Published online: 18 Mar 2009 [3] Published as: Journal of Economic Methodology, (2009), Vol. 16, (1), pp. 1-19. [4] The Journal of Economic Methodology is the international scholarly journal of the International Network for Economic Method (INEM).
Uncontrolled Keywords: price formation, zero-intelligence agents, Marshallian dynamics, rationality assumptions, utility maximization, experimental markets, partial equilibrium
Subjects: B Philosophy. Psychology. Religion > BF Psychology
H Social Sciences > HB Economic Theory
Faculty / Department / Research Group: Faculty of Business > Centre for Business Network Analysis (CBNA)
Faculty of Business > Networks and Urban Systems Centre (NUSC) > Centre for Business Network Analysis (CBNA)
Faculty of Business > Department of International Business & Economics
Related URLs:
Last Modified: 14 Oct 2016 09:13
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/5244

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