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On the extent and origins of the Merton model`s credit spread puzzle : a study of the credit risk pricing of Norwegian corporate bonds 2003-2014

Langdalen, Håkon; Johansen, Vetle Holt
Master thesis
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URI
http://hdl.handle.net/11250/2403486
Date
2016
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  • Master Thesis [4207]
Abstract
For decades, financial literature has attempted to understand the pricing of credit risk in

corporate bonds, and the Merton (1974) model is one of the classic approaches to determine a

theoretic size for this credit risk premium. However, empirical studies have shown that the

model`s estimates deviate substantially from observed credit spreads, a phenomenon called

the “credit spread puzzle”. In our thesis, we implement an augmented Merton model from

Feldhütter and Schaefer (2015), and compare the model`s estimates to 13,560 real-life spreads

of Norwegian corporate bonds 2003-2014. On an aggregate level, the model only explains

26% of the median spread to the swap rate, a result consistent with previous Norwegian

studies. A decomposition of the model mispricing discloses several potential explanations for

the credit spread puzzle. Firstly, the model input factors for debt leverage and issuer volatility

are key drivers of the puzzle. The model underestimation is particularly strong for safe bonds

with low leverage or volatility, and we highlight problems of historic volatility measures and

the precautionary motives for holding low leverage as potential explanations for these

patterns. Secondly, sector affiliation correlate with the model mispricing, and when we

control for other factors, we find that investors in the Norwegian corporate bond market

charge an additional premium for companies in the industrial sector compared to others.

Thirdly, despite the importance of bond liquidity and the Fama & French (1993) factors for

size and growth in previous literature, we find that the presence of these factors seems limited

in explaining the credit spread puzzle in our sample. In total, our thesis illustrates the

complexity of credit risk pricing. To a large degree, the valuation of Norwegian corporate

bonds remains an activity for professional investors, whose analysis of the particular issuer

can incorporate a far more detailed level of risk characteristics than what is possible in a

simple credit risk model.

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