Numeraire-invariant quadratic hedging and mean–variance portfolio allocation

Černý, Aleš, Czichowsky, Christoph ORCID: 0000-0002-3513-6843 and Kallsen, Jan (2024) Numeraire-invariant quadratic hedging and mean–variance portfolio allocation. Mathematics of Operations Research, 49 (2). 752 - 781. ISSN 0364-765X

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Abstract

The paper investigates quadratic hedging in a semimartingale market that does not necessarily contain a risk-free asset. An equivalence result for hedging with and without numeraire change is established. This permits direct computation of the optimal strategy without choosing a reference asset and/or performing a numeraire change. New explicit expressions for optimal strategies are obtained, featuring the use of oblique projections that provide unified treatment of the case with and without a risk-free asset. The analysis yields a streamlined computation of the efficient frontier for the pure investment problem in terms of three easily interpreted processes. The main result advances our understanding of the efficient frontier formation in the most general case in which a risk-free asset may not be present. Several illustrations of the numeraire-invariant approach are given.

Item Type:	Article
Official URL:	https://pubsonline.informs.org/journal/moor
Additional Information:	© 2023 Institute for Operations Research and the Management Sciences
Divisions:	Mathematics
Subjects:	Q Science > QA Mathematics
Date Deposited:	10 Jul 2023 09:27
Last Modified:	12 Dec 2024 03:48
URI:	http://eprints.lse.ac.uk/id/eprint/119695

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