Rational Expectations, psychology and inductive learning via moving thresholds

Details Rational Expectations, psychology and inductive learning via moving thresholds Rational Expectations, psychology and inductive learning via moving thresholds

2007-09-26

arxiv.org/abs/0709.4242v1

Economy

Quantitative Finance

Trading and Market Microstructure

APFA6 Conference

Scientific paper

10.1016/j.physa.2008.01.061

This work suggests modifications to a previously introduced class of heterogeneous agent models that allow for the inclusion of different types of agent motivations and behaviours in a unified way. The agents operate within a highly simplified environment where they are only able to be long or short one unit of the asset. The price of the asset is influenced by both an external information stream and the demand of the agents. The current strategy of each agent is defined by a pair of moving thresholds straddling the current price. When the price crosses either of the thresholds for a particular agent, that agent switches position and a new pair of thresholds is generated. Different kinds of threshold motion correspond to different sources of motivation, running the gamut from purely rational information-processing, through rational (but often undesirable) behaviour induced by perverse incentives and moral hazards, to purely psychological effects. As with the previous class of models, the fact that the simplest model of this kind precisely conforms to the Efficient Market Hypothesis allows causal relationships to be established between properties at the agent level and violations of EMH price statistics at the global level.

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