Credit rating agencies and unsystematic risk: Is there a linkage?
This study analyzes the effects of six different credit rating announcements on systematic and unsystematic risk in Spanish companies listed on the Electronic Continuous Stock Market from 1988 to 2010. We use an extension of the event study dummy approach that includes direct effects on beta risk and on volatility. We find effects in both kinds of risk, indicating that rating agencies provide information to the market. Rating actions that imply an improvement in credit quality cause lower systematic and unsystematic risk. Conversely, ratings announcements that imply credit quality deterioration cause a rebalance in both types of risk, with higher beta risk being joined with lower diversifiable risk. Although the event characteristics were not important to determine how the two types of risk reacted to rating actions, the 2007 economic and financial crises increase the market’s sensitivity to these characteristics.
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- Arnoud W. A. Boot & Todd T. Milbourn, 2002.
"Credit Ratings as Coordination Mechanisms,"
William Davidson Institute Working Papers Series
457, William Davidson Institute at the University of Michigan.
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"Risk and Return Around Bond Rating Changes: New Evidence From the Spanish Stock Market,"
Journal of Business Finance & Accounting,
Wiley Blackwell, vol. 33(5-6), pages 885-908.
- Pilar Abad Romero & M. Dolores Robles Fernández, 2005. "Risk and returns around bond rating changes: New evidence from the Spanish Stock Market," Documentos de Trabajo del ICAE 0505, Universidad Complutense de Madrid, Facultad de Ciencias Económicas y Empresariales, Instituto Complutense de Análisis Económico.
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"Have Individual Stocks Become More Volatile? An Empirical Exploration of Idiosyncratic Risk,"
3128707, Harvard University Department of Economics.
- John Y. Campbell, 2001. "Have Individual Stocks Become More Volatile? An Empirical Exploration of Idiosyncratic Risk," Journal of Finance, American Finance Association, vol. 56(1), pages 1-43, 02.
- John Y. Campbell & Martin Lettau & Burton G. Malkiel & Yexiao Xu, 2000. "Have Individual Stocks Become More Volatile? An Empirical Exploration of Idiosyncratic Risk," NBER Working Papers 7590, National Bureau of Economic Research, Inc.
- May, Anthony D., 2010. "The impact of bond rating changes on corporate bond prices: New evidence from the over-the-counter market," Journal of Banking & Finance, Elsevier, vol. 34(11), pages 2822-2836, November.
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