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Optimal consumption and investment under transaction costs

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

Abstract

In this paper, we consider the Merton problem in a market with a single risky asset and proportional transaction costs. We give a complete solution of the problem up to the solution of a first‐crossing problem for a first‐order differential equation. We find that the characteristics of the solution (e.g., well‐posedness) can be related to some simple properties of a univariate quadratic whose coefficients are functions of the parameters of the problem. Our solution to the problem via the value function includes expressions for the boundaries of the no‐transaction wedge. Using these expressions, we prove a precise condition for when leverage occurs. One new and unexpected result is that when the solution to the Merton problem (without transaction costs) involves a leveraged position, and when transaction costs are large, the location of the boundary at which sales of the risky asset occur is independent of the transaction cost on purchases.

Suggested Citation

  • David Hobson & Alex S. L. Tse & Yeqi Zhu, 2019. "Optimal consumption and investment under transaction costs," Mathematical Finance, Wiley Blackwell, vol. 29(2), pages 483-506, April.
    • Handle: RePEc:bla:mathfi:v:29:y:2019:i:2:p:483-506
    DOI: 10.1111/mafi.12187
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    Cited by:

    1. David Hobson & Alex S. L. Tse & Yeqi Zhu, 2019. "A multi-asset investment and consumption problem with transaction costs," Finance and Stochastics, Springer, vol. 23(3), pages 641-676, July.
    2. Jia Yue & Ming-Hui Wang & Nan-Jing Huang, 2022. "Global Optimal Consumption–Portfolio Rules with Myopic Preferences and Loss Aversion," Computational Economics, Springer;Society for Computational Economics, vol. 60(4), pages 1427-1455, December.
    3. Alex S. L. Tse, 2020. "Dividend policy and capital structure of a defaultable firm," Mathematical Finance, Wiley Blackwell, vol. 30(3), pages 961-994, July.
    4. Alex S. L. Tse & Harry Zheng, 2023. "Speculative trading, prospect theory and transaction costs," Finance and Stochastics, Springer, vol. 27(1), pages 49-96, January.
    5. Alex S. L. Tse & Harry Zheng, 2019. "Speculative Trading, Prospect Theory and Transaction Costs," Papers 1911.10106, arXiv.org, revised Oct 2022.

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