On the Diversification of Fixed Income Assets

Olivier Le Courtois
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Olivier Le Courtois: Department of Economics and Finance, Emlyon Business School, 23, Avenue Guy de Collongue, CEDEX, 69134 Ecully, France

Risks, 2022, vol. 10, issue 2, 1-21

Abstract: This article introduces a new approach for dealing with the diversification/concentration risk of fixed income assets. Because Government bonds, corporate bonds, and mortgage backed securities constitute a large proportion of the assets of institutional investors in most countries, it is important to be able to determine the number of lines/issuers of such assets, not only for portfolio management but also for risk management purposes. The approach that I introduce shows the dependence of the critical number of lines of fixed income assets on the main interest rate risk and credit risk drivers. Specifically, I examine the importance of volatility risk, force of mean reversion, default risk, recovery risk, and default dependence risk on the critical number of assets in a fixed income portfolio. The methodology in this paper relies on the use of the coefficient of variation for the computation of the critical number of credit-sensitive securities in a fixed income portfolio. To the best of my knowledge, this paper is the first to develop such an approach.

Keywords: diversification; interest rate risk; credit risk; asset-liability management; corporate bonds; fixed income (search for similar items in EconPapers)
JEL-codes: C G0 G1 G2 G3 K2 M2 M4 (search for similar items in EconPapers)
Date: 2022
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