Consistent Investment of Sophisticated Rank-Dependent Utility Agents in Continuous Time

Ying Hu (), Hanqing Jin () and Xun Yu Zhou
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Ying Hu: IRMAR - Institut de Recherche Mathématique de Rennes - UR - Université de Rennes - INSA Rennes - Institut National des Sciences Appliquées - Rennes - INSA - Institut National des Sciences Appliquées - ENS Rennes - École normale supérieure - Rennes - UR2 - Université de Rennes 2 - CNRS - Centre National de la Recherche Scientifique - INSTITUT AGRO Agrocampus Ouest - Institut Agro - Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement
Hanqing Jin: University of Oxford

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Abstract: We study portfolio selection in a complete continuous-time market where the preference is dictated by the rank-dependent utility. As such a model is inherently time inconsistent due to the underlying probability weighting, we study the investment behavior of sophisticated consistent planners who seek (subgame perfect) intra-personal equilibrium strategies. We provide sufficient conditions under which an equilibrium strategy is a replicating portfolio of a final wealth. We derive this final wealth profile explicitly, which turns out to be in the same form as in the classical Merton model with the market price of risk process properly scaled by a deterministic function in time. We present this scaling function explicitly through the solution to a highly nonlinear and singular ordinary differential equation, whose existence of solutions is established. Finally, we give a necessary and sufficient condition for the scaling function to be smaller than 1 corresponding to an effective reduction in risk premium due to probability weighting.

Keywords: Rank-dependent utility; probability weighting; portfolio selection; con- tinuous time; time inconsistency; intra-personal equilibrium strategy; market price of risk (search for similar items in EconPapers)
Date: 2021-05-28
New Economics Papers: this item is included in nep-upt
Note: View the original document on HAL open archive server: https://hal.science/hal-02624308v1
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Citations: View citations in EconPapers (6)

Published in Mathematical Finance, 2021, 31 (3), pp.1056-1095. ⟨10.1111/mafi.12315⟩

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Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:hal-02624308

DOI: 10.1111/mafi.12315

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