A Comparative Study of Structural Models of Corporate Bond Yields: An Exploratory Investigation

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Abstract
This paper empirically compares a variety of firm-value-based models of contingent claims. We formulate a general model which takes the perpetual coupon bond models of Merton (1974), Leland (1994) and Anderson, Sundaresan and Tychon (1996), as well as some immediate generalizations thereof, as special cases. We estimate these using aggregate time series data for the US corporate bond market, monthly, from August 1970 through December 1996. The data are average yields for industrial corporate bonds rated BBB, Treasury yields, leverage measures derived from the Flow of Funds Accounts, interest coverage measures derived from the National Income Accounts, and volatility measures derived from the stock market. In the basic specification with constant default free rates, we find that models with endogenous bankruptcy barriers (the Leland and the Anderson, Sundaresan and Tychon models) fit quite well. Thus, in these models, variations of leverage and asset volatility are found to account for much of the time-series variations of observed corporate yields. We then use the estimates to calculate the implied probability of default within N years. We find under plausible assumptions on the market risk-premium for levered firms that the models produce default probabilities for 5 years or more which are in line with the historical experience reported by Moodys.
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