Abstract
The microstructure of markets involves not only human traders’ learning and erring processes but also their heterogeneity. Much of this part has not been taken into account in the agent-based artificial markets, despite the fact that various computational intelligence tools have been applied to artificial-agent modeling. One possible reason for this little progress is due to the lack of good-quality data by which the learning and erring patterns of human traders can be easily archived and analyzed. In this chapter, we take a pioneering step in this direction by, first, conducting double auction market experiments and obtaining a dataset involving about 165 human traders. The controlled laboratory setting then enables us to anchor the observing trading behavior of human traders to a benchmark (a global optimum) and to develop a learning index by which the learning and erring patterns can be better studied, in particular, in light of traders’ personal attributes, such as their cognitive capacity and personality. The behavior of artificial traders driven by genetic programming (GP) is also studied in parallel to human traders; however, how to represent the observed heterogeneity using GP remains a challenging issue.
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Notes
- 1.
- 2.
- 3.
See [33] for a simple historical review of the use of this term.
- 4.
For example, the recently published handbook on metaheuristics [31] has no single mention of psychology.
- 5.
Probably partially because of this gap, artificial traders cannot replace human traders [15].
- 6.
- 7.
Chen [17] argues that genetic programming equips economists with a tool to model the chance-discovering agent, which is an essential element of modern economic theory.
- 8.
The details of the GP run in this chapter can be found in [22].
- 9.
The fundamental pursuit here is: when a mistake is made, what are the differences between that made by an artificial agent and that made by human agents?
- 10.
It does not have to be narrowly limited to the pecuniary costs associated with trading, such as broker fees or the Tobin tax. It can cost personal health as well [6].
- 11.
In fact, there are a total of 185 subjects attending the double auction experiments, but for some of them the data are incomplete. Hence, for the WMC test the valid sample has 165 subjects, and for the personality test the valid sample has 168 subjects. There are 151 subjects appearing in both samples.
- 12.
- 13.
While the conversation between psychology and economics has a long history and a rapidly growing literature, it was only very recently that economists started to take into account psychological attributes in their economic modeling and analysis.
- 14.
A survey is available from [21].
- 15.
From Fig. 2.7, for a trader who is identified as a case of learning the optimum in period 3, his learning index must be in plateau A in the first three periods. Actually, Subject 1531 started performing the optimal strategy in period 2 until the end of the experiment except for one period obviously due to a typo. Subject 1531 seems to thoroughly understand the market features in period 1, and then performs the optimum strategy seamlessly in period 2.
- 16.
This chapter and [24] are both under the umbrella of a 3-year NSC research project. Hence, they both share some similar features. What distinguishes [24] from this chapter is that the former explicitly constructs traders’ learning paths in a numerical landscape. The question is then to address whether the observed learning behavior of traders can also be understood as an output of a numerical search algorithm. In other words, they inquire whether there is a connection between behavioral search and numerical search. However, the trading environment here makes it hard to derive this geometrical representation; therefore, the use of a learning index becomes another way to see how this trap might actually also exist. Despite this difference, the implication of these two studies is the same: we need to equip artificial agents with different CI tools so that their search behavior can be meaningfully connected to the cognitive capacity of human traders, or, more directly, we need to reflect upon the cognitive capacity of different CI tools [19].
- 17.
As the psychological literature points out, high intelligence does not always contribute to high performance—the significance of intelligence in performance is more salient when the problems are more complex [25]. In addition, it appears that intelligence exhibits a decreasing marginal contribution in terms of performances [29, 37]. In the setting of an agent-based double auction market, Chen et al. [23] have replicated this diminishing marginal contribution of cognitive capacity. In that article, autonomous traders are modeled by genetic programming with different population size. The population size is manipulated as a proxy variable for working memory capacity. They then found that, while the trading performance between agents with small population size and agents with a large one is significantly different, this difference between agents with a large one and agents with a larger one is negligible.
- 18.
There is no official translation of the seven factors. An attempt to do so on our own is not easy, in particular if one wants to describe the whole of 15–20 adjectives using a single word, such as conscientiousness. What we do here is to follow OCEAN closely and to use the same name if the factor in Big Seven shares very much in common with one of the Big Five. Examples are conscientiousness, agreeableness, and extraversion.
- 19.
- 20.
In fact, both our student t-test and Wilcoxon rank sum test only find this factor statistically significantly different between the performing group and the non-performing group.
- 21.
- 22.
Among the seven factors, Chen et al. [24] find conscientiousness, extraversion, and agreeableness to be influential, at least in some contexts. In their analysis, they attempt to justify each of these three. Among the three, conscientiousness is probably the easiest one to justify, given the already lengthily archived documents (see footnote 2.4.3). They then go further to justify the other two by using [28] to argue that extraverted subjects are more sensitive to potential rewarding stimuli through the mesolimbic dopamine, which may in turn help them more easily find the more profitable trading arrangements. In addition, for agreeableness, they argue that subjects with a higher degree of agreeableness can resist time pressure and may be able to think for a longer time before making decisions.
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Acknowledgements
The authors are grateful to Professor Kuo-Shu Yang for his generous permission for using his developed Chinese version of the Big-Five personality test. We are also grateful to Professor Li-Jen Weng and Professor Lei-**eng Yang for their advice and guidance on the psychological tests implemented in this study. NSC research grants no. 98-2410-H-004-045-MY3, no. 99-2811-H-004-014, and no. 100-2410-H-029-001 are also gratefully acknowledged.
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Chen, SH., Shih, KC., Tai, CC. (2012). Can Artificial Traders Learn and Err Like Human Traders? A New Direction for Computational Intelligence in Behavioral Finance. In: Doumpos, M., Zopounidis, C., Pardalos, P. (eds) Financial Decision Making Using Computational Intelligence. Springer Optimization and Its Applications, vol 70. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-3773-4_2
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