How Integrated Are Credit and Equity Markets? Evidence From Index Options

In recent years, a liquid market for options on a broad credit default swap index (CDX) has developed. We study the extent to which these options are priced consistently with options on a broad equity index (SPX). We consider a rich structural credit risk model in which firm assets follow a jump-dif...

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Published inIDEAS Working Paper Series from RePEc
Main Authors Collin-Dufresne, Pierre, Junge, Benjamin, Trolle, Anders B
Format Paper
LanguageEnglish
Published St. Louis Federal Reserve Bank of St. Louis 01.01.2020
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Abstract In recent years, a liquid market for options on a broad credit default swap index (CDX) has developed. We study the extent to which these options are priced consistently with options on a broad equity index (SPX). We consider a rich structural credit risk model in which firm assets follow a jump-diffusion process with idiosyncratic and systematic risk, and we derive analytical expressions for CDX and SPX options. Calibrating the model, we find that it captures many aspects of the joint dynamics of CDX and SPX options. However, it cannot reconcile the relative levels of option implied volatilities, suggesting that credit and equity markets are not fully integrated. A strategy of selling CDX options yields significantly higher average excess returns and Sharpe ratios than selling SPX options.
AbstractList In recent years, a liquid market for options on a broad credit default swap index (CDX) has developed. We study the extent to which these options are priced consistently with options on a broad equity index (SPX). We consider a rich structural credit risk model in which firm assets follow a jump-diffusion process with idiosyncratic and systematic risk, and we derive analytical expressions for CDX and SPX options. Calibrating the model, we find that it captures many aspects of the joint dynamics of CDX and SPX options. However, it cannot reconcile the relative levels of option implied volatilities, suggesting that credit and equity markets are not fully integrated. A strategy of selling CDX options yields significantly higher average excess returns and Sharpe ratios than selling SPX options.
Author Junge, Benjamin
Trolle, Anders B
Collin-Dufresne, Pierre
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