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Examples and Counterexamples of Cost-efficiency in Incomplete Markets

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  • Carole Bernard
  • Stephan Sturm

Abstract

We present a number of examples and counterexamples to illustrate the results on cost-efficiency in an incomplete market obtained in [BS24]. These examples and counterexamples do not only illustrate the results obtained in [BS24], but show the limitations of the results and the sharpness of the key assumptions. In particular, we make use of a simple 3-state model in which we are able to recover and illustrate all key results of the paper. This example also shows how our characterization of perfectly cost-efficient claims allows to solve an expected utility maximization problem in a simple incomplete market (trinomial model) and recover results from [DS06, Chapter 3], there obtained using duality.

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  • Carole Bernard & Stephan Sturm, 2024. "Examples and Counterexamples of Cost-efficiency in Incomplete Markets," Papers 2407.08756, arXiv.org.
    • Handle: RePEc:arx:papers:2407.08756
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    References listed on IDEAS

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    1. Philip H. Dybvig, 1988. "Inefficient Dynamic Portfolio Strategies or How to Throw Away a Million Dollars in the Stock Market," The Review of Financial Studies, Society for Financial Studies, vol. 1(1), pages 67-88.
    2. Bernard Carole & Vanduffel Steven, 2015. "Quantile of a Mixture with Application to Model Risk Assessment," Dependence Modeling, De Gruyter, vol. 3(1), pages 1-10, October.
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