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A Multifactor Model of Credit Spreads

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Abstract

We represent credit spreads across ratings as a function of common unobservable factors of the Vasicek form. Using a state-space approach we estimate the factors, their process parameters, and the exposure of each observed credit spread series to each factor. We find that most of the systematic variation across credit spreads is captured by three factors. The factors are closely related to the implied volatility index (VIX), the long bond rate, and S&P500 returns, supporting the predictions of structural models of default at an aggregate level. By making no prior assumption about the determinants of yield spread dynamics, our study provides an original and independent test of theory. The results also contribute to the current debate about the role of liquidity in corporate yield spreads. While recent empirical literature shows that the level and time-variation in corporate yield spreads is driven primarily by a systematic liquidity risk factor, we find that the three most important drivers of yield spread levels relate to macroeconomic variables. This suggests that if credit spread levels do contain a large liquidity premium, the time variation of this premium is likely driven by the same factors as default risk.

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Authors and Affiliations

  1. School of Banking and Finance, University of New South Wales, UNSW, Sydney, NSW, 2052, Australia

    Ramaprasad Bhar

  2. School of Banking and Finance, University of New South Wales & Tudor Investment Corporation, Sydney, NSW, Australia

    Nedim Handzic

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  1. Ramaprasad Bhar
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  2. Nedim Handzic
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Correspondence to Ramaprasad Bhar.

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Bhar, R., Handzic, N. A Multifactor Model of Credit Spreads. Asia-Pac Financ Markets 18, 105–127 (2011). https://doi.org/10.1007/s10690-010-9123-3

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