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Optimal consumption under a drawdown constraint over a finite horizon

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Listed:
  • Xiaoshan Chen
  • Xun Li
  • Fahuai Yi
  • Xiang Yu

Abstract

This paper studies a finite horizon utility maximization problem on excessive consumption under a drawdown constraint up to the bankruptcy time. Our control problem is an extension of the one considered in Bahman et al. (2019) to the model with a finite horizon and also an extension of the one considered in Jeon and Oh (2022) to the model with zero interest rate. Contrary to Bahman et al. (2019), we encounter a parabolic nonlinear HJB variational inequality with a gradient constraint, in which some time-dependent free boundaries complicate the analysis significantly. Meanwhile, our methodology is built on technical PDE arguments, which differs substantially from the martingale approach in Jeon and Oh (2022). Using dual transform and considering some auxiliary parabolic variational inequalities with both gradient and function constraints, we establish the existence and uniqueness of the classical solution to the HJB variational inequality and characterize all associated free boundaries in analytical form. Consequently, the piecewise optimal feedback controls and some time-dependent thresholds of the wealth variable for different control expressions can be obtained.

Suggested Citation

  • Xiaoshan Chen & Xun Li & Fahuai Yi & Xiang Yu, 2022. "Optimal consumption under a drawdown constraint over a finite horizon," Papers 2207.07848, arXiv.org.
    • Handle: RePEc:arx:papers:2207.07848
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    References listed on IDEAS

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