An Empirical Study on Credit Rating Change Behavior

Author(s):  
Yu Du ◽  
Wulin Suo
2018 ◽  
Vol 11 (4) ◽  
pp. 87 ◽  
Author(s):  
Hong-Ming Yin ◽  
Jin Liang ◽  
Yuan Wu

In this paper, we consider a new corporate bond-pricing model with credit-rating migration risks and a stochastic interest rate. In the new model, the criterion for rating change is based on a predetermined ratio of the corporation’s total asset and debt. Moreover, the rating changes are allowed to happen a finite number of times during the life-span of the bond. The volatility of a corporate bond price may have a jump when a credit rating for the bond is changed. Moreover, the volatility of the bond is also assumed to depend on the interest rate. This new model improves the previous existing bond models in which the rating change is only allowed to occur once with an interest-dependent volatility or multi-ratings with constant interest rate. By using a Feynman-Kac formula, we obtain a free boundary problem. Global existence and uniqueness are established when the interest rate follows a Vasicek’s stochastic process. Calibration of the model parameters and some numerical calculations are shown.


2021 ◽  
Vol 11 (2) ◽  
pp. 58-70
Author(s):  
Ola Nilsson

This study investigates whether legislative pressure influences credit rating agency (CRA) behavior. It covers a time period in which the European Union moves from exerting minimal to intense legislative pressure on CRAs, providing an almost ideal context for analyzing if and how CRAs are affected by this pressure. Two possible outcomes are discussed: 1) more timeliness in the flow of information and 2) more stickiness in the flow of information. The analysis is based on an examination of market reactions following CRA announcements between 2000 and 2019. The results show that the market reactions after CRA announcements decrease when legislative pressure increases. The interpretation is that as legislative pressure increases, the flow of information from CRAs becomes stickier. This confirms that legislative initiatives that put pressure on CRAs have an effect, evidence that legislators’ intention to change behavior by threatening or initiating new regulations works, which confirms assumptions underlying the theory of legislative threats (Halfteck, 2008). A reasonable interpretation of legislators’ push for changes in this context is that they want to see a faster flow of information. The results, however, show the opposite. A plausible explanation for this is increased caution on the part of CRAs because if in retrospect, the information in an announcement turns out to be wrong or misleading, the ensuing criticism could lead to additional pressure.


2017 ◽  
Vol 13 (3) ◽  
pp. 563-585 ◽  
Author(s):  
Min-Shik Shin ◽  
◽  
Jae-Ik Lee ◽  
Ho-Yeong Jeong ◽  
◽  
...  

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