Structural models of credit risk are useful: Evidence from hedge ratios on corporate bonds

• Published in: Journal of financial economics 2008-10, Vol.90 (1), p.1-19
• Main Authors: Schaefer, Stephen M., Strebulaev, Ilya A.
• Format: Article
• Language: English
• Subjects: Bonds; Corporate bonds; Corporate debt; Credit; Credit risk; Credit risk Structural models Hedge ratios Credit spreads; Credit spreads; Forecasts; Hedge ratios; Interest rates; Pricing; Rates of return; Risk; Securities prices; Structural analysis; Structural models; Studies
• ISSN: 0304-405X; 1879-2774
• DOI: 10.1016/j.jfineco.2007.10.006

Structural models of credit risk provide poor predictions of bond prices. We show that, despite this, they provide quite accurate predictions of the sensitivity of corporate bond returns to changes in the value of equity (hedge ratios). This is important since it suggests that the poor performance of structural models may have more to do with the influence of non-credit factors rather than their failure to capture the credit exposure of corporate debt. The main result of this paper is that even the simplest of the structural models [Merton, R., 1974. On the pricing of corporate debt: the risk structure of interest rates. Journal of Finance 29, 449–470] produces hedge ratios that are not rejected in time-series tests. However, we find that the Merton model (with or without stochastic interest rates) does not capture the interest rate sensitivity of corporate debt, which is substantially lower than would be expected from conventional duration measures. The paper also shows that corporate bond prices are related to a number of market-wide factors such as the Fama-French SMB (small minus big) factor in a way that is not predicted by structural models.