The Information Content of Option-Implied Volatility for Credit Default Swap Valuation
by Charles Cao of the Pennsylvania State University & China Center for Financial Research,
September 9, 2009
Abstract: Credit default swaps (CDS) are similar to out-of-the-money put options in that both offer a low cost and effective protection against downside risk. This study investigates whether put optionimplied volatility is an important determinant of CDS spreads. Using a large sample of firms with both CDS and options data, we find that individual firms' put option-implied volatility dominates historical volatility in explaining the time-series variation in CDS spreads. To understand this result, we show that implied volatility is a more efficient forecast for future realized volatility than historical volatility. More importantly, the volatility risk premium embedded in option prices covaries with the CDS spread. These findings complement existing empirical evidence based on market-level data.
Keywords: Credit default swaps, Option implied volatility, Historical volatility, Price discovery, Volatility risk premium
Published in: Journal of Financial Markets, Vol. 13, No. 3, (August 2010), pp.321-343.