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Published in: Finance and Stochastics 1/2018

13-11-2017

Replicating portfolio approach to capital calculation

Authors: Mathieu Cambou, Damir Filipović

Published in: Finance and Stochastics | Issue 1/2018

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Abstract

The replicating portfolio (RP) approach to the calculation of capital for life insurance portfolios is an industry standard. The RP is obtained from projecting the terminal loss of discounted asset–liability cash flows on a set of factors generated by a family of financial instruments that can be efficiently simulated. We provide the mathematical foundations and a novel dynamic and path-dependent RP approach for real-world and risk-neutral sampling. We show that our RP approach yields asymptotically consistent capital estimators if the chaotic representation property holds. We illustrate the tractability of the RP approach by three numerical examples.

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Appendix
Available only for authorised users
Footnotes
1
There is no such relation between \(C_{1}^{{\mathbb {P}}}\) and \(C_{2}^{{\mathbb {P}}}\). For example, let \(D_{T}/D_{1}\) be such that we have \({\mathbb {E}}^{\mathbb {P}} [D_{T}^{2}/D_{1}^{2}\mid{\mathcal {F}}_{1} ]=1/D_{1}^{2}\) and assume that \({\mathbb {E}}^{\mathbb {P}}[1/D_{1}^{2} ]=\infty\). Then \(C_{1}^{{\mathbb {P}}}=1\), but \(C_{2}^{{\mathbb {P}}}=\infty\). Conversely, assume that \(D_{T}=D_{1}\) and \({\mathbb {E}}^{\mathbb {P}}[D_{1}^{2} ]=\infty\). Then \(C_{2}^{{\mathbb {P}}}=1\), but \(C_{1}^{{\mathbb {P}}}=\infty\).
 
2
The computation of the initial asset–liability value is not the subject of this paper. It could be estimated by the same methods. The value of insurance liabilities in practice includes a risk margin that is determined as cost of future solvency capital for the asset–liability portfolio. For more details, we refer to Filipović [12, Sect. 1].
 
3
Formally, we assume that primary and sample random variables \(A(\omega)= A(\omega_{1})\) and \(A^{(j)}(\omega)= A^{(j)}(\omega_{2})\), etc., with \(\omega=(\omega_{1},\omega_{2})\), are modeled on a product space \(\Omega=\Omega'\times\Omega'\), \({\mathcal {F}}= {\mathcal {F}}'\otimes{\mathcal {F}}'\) equipped with product probability measures \({\mathbb {M}}= {\mathbb {M}}'\otimes{\mathbb {M}}'\).
 
4
While the rebalancing frequency of a real insurance asset–liability portfolio is adaptive, quarterly rebalancing for the long-term projection is a reasonable assumption.
 
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Metadata
Title
Replicating portfolio approach to capital calculation
Authors
Mathieu Cambou
Damir Filipović
Publication date
13-11-2017
Publisher
Springer Berlin Heidelberg
Published in
Finance and Stochastics / Issue 1/2018
Print ISSN: 0949-2984
Electronic ISSN: 1432-1122
DOI
https://doi.org/10.1007/s00780-017-0347-1

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