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A multi-asset investment and consumption problem with transaction costs

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  • David Hobson
  • Alex S. L. Tse
  • Yeqi Zhu

Abstract

In this article we study a multi-asset version of the Merton investment and consumption problem with proportional transaction costs. In general it is difficult to make analytical progress towards a solution in such problems, but we specialise to a case where transaction costs are zero except for sales and purchases of a single asset which we call the illiquid asset. Assuming agents have CRRA utilities and asset prices follow exponential Brownian motions we show that the underlying HJB equation can be transformed into a boundary value problem for a first order differential equation. The optimal strategy is to trade the illiquid asset only when the fraction of the total portfolio value invested in this asset falls outside a fixed interval. Important properties of the multi-asset problem (including when the problem is well-posed, ill-posed, or well-posed only for large transaction costs) can be inferred from the behaviours of a quadratic function of a single variable and another algebraic function.

Suggested Citation

  • David Hobson & Alex S. L. Tse & Yeqi Zhu, 2016. "A multi-asset investment and consumption problem with transaction costs," Papers 1612.01327, arXiv.org.
    • Handle: RePEc:arx:papers:1612.01327
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    References listed on IDEAS

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    Cited by:

    1. Alex S. L. Tse, 2018. "Dividend Policy and Capital Structure of a Defaultable Firm," Papers 1810.03501, arXiv.org.

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