Time-consistent mean-variance portfolio selection in discrete and continuous time

Czichowsky, Christoph ORCID: 0000-0002-3513-6843 (2013) Time-consistent mean-variance portfolio selection in discrete and continuous time. Finance and Stochastics, 17 (2). pp. 227-271. ISSN 0949-2984

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Abstract

It is well known that mean-variance portfolio selection is a time-inconsistent optimal control problem in the sense that it does not satisfy Bellman’s optimality principle and therefore the usual dynamic programming approach fails. We develop a time-consistent formulation of this problem, which is based on a local notion of optimality called local mean-variance efficiency, in a general semimartingale setting. We start in discrete time, where the formulation is straightforward, and then find the natural extension to continuous time. This complements and generalises the formulation by Basak and Chabakauri (2010) and the corresponding example in Björk and Murgoci (2010), where the treatment and the notion of optimality rely on an underlying Markovian framework. We justify the continuous-time formulation by showing that it coincides with the continuous-time limit of the discrete-time formulation. The proof of this convergence is based on a global description of the locally optimal strategy in terms of the structure condition and the Föllmer–Schweizer decomposition of the mean-variance trade-off. As a by-product, this also gives new convergence results for the Föllmer–Schweizer decomposition, i.e., for locally risk-minimising strategies.

Item Type:	Article
Official URL:	http://link.springer.com.gate2.library.lse.ac.uk/j...
Additional Information:	© 2013 Springer, Part of Springer Science+Business Media
Divisions:	Mathematics
JEL classification:	C - Mathematical and Quantitative Methods > C6 - Mathematical Methods and Programming > C61 - Optimization Techniques; Programming Models; Dynamic Analysis G - Financial Economics > G1 - General Financial Markets > G11 - Portfolio Choice; Investment Decisions
Date Deposited:	26 Sep 2013 13:32
Last Modified:	20 Nov 2024 07:21
Projects:	Project D1
Funders:	National Centre of Competence in Research “Financial Valuation and Risk Management” (NCCR FINRISK)
URI:	http://eprints.lse.ac.uk/id/eprint/53127

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