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Super-exponential endogenous bubbles in an equilibrium model of rational and noise traders

  • T. Kaizoji
  • M. Leiss
  • A. Saichev
  • D. Sornette

We introduce a model of super-exponential financial bubbles with two assets (risky and risk-free), in which rational investors and noise traders co-exist. Rational investors form expectations on the return and risk of a risky asset and maximize their constant relative risk aversion expected utility with respect to their allocation on the risky asset versus the risk-free asset. Noise traders are subjected to social imitation and follow momentum trading. Allowing for random time-varying herding propensity, we are able to reproduce several well-known stylized facts of financial markets such as a fat-tail distribution of returns and volatility clustering. In particular, we observe transient faster-than-exponential bubble growth with approximate log-periodic behavior and give analytical arguments why this follows from our framework. The model accounts well for the behavior of traders and for the price dynamics that developed during the dotcom bubble in 1995-2000. Momentum strategies are shown to be transiently profitable, supporting these strategies as enhancing herding behavior.

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File URL: http://arxiv.org/pdf/1109.4726
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Paper provided by arXiv.org in its series Papers with number 1109.4726.

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Date of creation: Sep 2011
Date of revision: Mar 2014
Handle: RePEc:arx:papers:1109.4726
Contact details of provider: Web page: http://arxiv.org/

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