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Rational Decisions, Random Matrices and Spin Glasses

  • Stefano Galluccio

    (CEA-Saclay and Science et Finance)

  • Jean-Philippe Bouchaud

    (CEA-Saclay and Science et Finance)

  • Marc Potters

    (CEA-Saclay and Science et Finance)

We consider the problem of rational decision making in the presence of nonlinear constraints. By using tools borrowed from spin glass and random matrix theory, we focus on the portfolio optimisation problem. We show that the number of ``optimal'' solutions is generically exponentially large: rationality is thus de facto of limited use. In addition, this problem is related to spin glasses with L\'evy-like (long-ranged) couplings, for which we show that the ground state is not exponentially degenerate.

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File URL: http://arxiv.org/pdf/cond-mat/9801209
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Paper provided by arXiv.org in its series Papers with number cond-mat/9801209.

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Date of creation: Jan 1998
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Handle: RePEc:arx:papers:cond-mat/9801209
Contact details of provider: Web page: http://arxiv.org/

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