Consistent investment of sophisticated rank‐dependent utility agents in continuous time. (28th May 2021)

• Record Type: Journal Article
• Authors: Hu, Ying; Jin, Hanqing; Zhou, Xun Yu
• Is Part Of: Mathematical finance. Volume 31:Number 3(2021)
• Page Start: 1056
• Page End: 1095
• Publication Date: 2021-05-28
• Subjects: continuous time -- intra‐personal equilibrium strategy -- market price of risk -- portfolio selection -- probability weighting -- rank‐dependent utility -- time inconsistency; Business mathematics -- Periodicals; 332
• DOI: 10.1111/mafi.12315
• Languages: English
• ISSNs: 0960-1627

Abstract

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 a 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 one corresponding to an effective reduction in risk premium due to probability weighting.