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Transaction taxes, greed and risk aversion in an agent-based financial market model

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Abstract

Recent agent-based financial market models came to the result that taxing financial transactions does not per se increase financial stability and that the response of volatility and misalignments to rising tax rates seem to be u-shaped. Moreover, greed and the risk appetite of traders are often blamed for financial instability and there is no evidence how greed and risk aversion affect the effectiveness of regulations in financial markets. We aim to add to this gap in the literature by analyzing how the effectiveness of transaction taxes depend on different behavioral patterns within an agent-based framework. Our simulations indicate that a tax rate of 0.1% demarcates the stabilizing tax regime from the destabilizing one. We figure out that transaction taxes are less effective, either when chartists trade more aggressively, fundamentalists trade less aggressively, agents switch more frequently between trading strategies or only have short memory in their fitness measures. Lower risk aversion of agents, however, makes higher tax rates more effective as indicated by a flatter volatility response curve. We conclude that additional regulations should concentrate on the traders’ responsibilities for their risk-exposure.

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Correspondence to Markus Demary.

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Demary, M. Transaction taxes, greed and risk aversion in an agent-based financial market model. J Econ Interact Coord 6, 1–28 (2011). https://doi.org/10.1007/s11403-010-0071-9

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  • DOI: https://doi.org/10.1007/s11403-010-0071-9

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