信用评级变动能反映企业真实财务信息吗?——基于财务重述的视角

本文以2007-2018年拥有主体信用评级的A股上市公司为研究对象,利用企业财务错报在未来被重述这一场景,检验主体信用评级变动能否反映企业真实财务信息。研究发现,评级机构在发债企业财务错报年显著下调了主体信用评级,而在重述公告发布年没有上述现象,这表明主体信用评级下调反映了企业的真实财务信息。在控制内生性影响后,结论仍然成立。进一步研究发现,发债企业当期财务错报涉及盈余时,主体信用评级被下调的幅度更大,说明评级机构更加关注与盈余相关的财务信息。机制分析表明,评级机构维护自身声誉是主体信用评级变动能够反映企业真实财务信息的主要机制。此外,主体信用评级被下调还导致了资本市场投资者的负面反应。本文的研究结果为主体信用评级变动反映企业真实财务信息提供了直接的证据支持,揭示了主体信用评级的信息含量,也对理解中国情境下评级机构调整主体信用评级的行为动机提供参考。     

金融中介机构竞争的市场反应--来自信用评级机构的证据北大核心

目前已有研究认为金融中介机构竞争会带来市场效率的提高,本文利用2012-2017年债券市场的微观数据研究“发行人付费”模式评级机构之间的竞争对评级结果的影响。研究发现,评级机构竞争会导致评级结果膨胀与评级质量下降。进一步研究发现,当评级竞争加剧时,“发行人付费”模式的评级机构会对有较多业务联系的企业放松评级标准,给予更高信用评级。我们的研究也发现评级机构的外资背景、承销商的良好声誉和媒体关注均有助于减小“发行人付费”模式下评级机构竞争的负面影响。同时,债券市场评级竞争还存在对股票市场的溢出效应,评级竞争导致的评级质量下降也降低了股票市场的信息效率。这说明,“发行人付费”模式下的评级机构竞争会降低资本市场的信息效率,“投资者付费”模式的推广和评级行业的对外开放有助于改善国内评级行业的评级质量。本文的研究也为国内债券市场进一步发挥双评级、多评级以及不同模式评级的交叉验证作用提供了一定证据支持。     

私有信息、评级偏差和中国评级机构的市场声誉

考虑到评级机构拥有市场声誉的本质在于其可以通过扭曲评级从而对市场产生影响,本文分两步研究中国发行人付费评级机构的市场声誉:第一步,将信用评级对各种基本面因素进行回归,并以实际评级与回归预测值的差值作为评级偏差的量度。与既有文献相比,本文的重要改进是在基本面因素中引入了发债企业与各评级机构(分支机构)最短距离的均值和方差,这能较好地控制因发债企业私有信息可能造成的选择偏误。第二步,考察评级偏差和机构特征如何影响企业的发债成本。研究表明,中国评级机构作为一个整体具有显著的市场声誉,但各评级机构之间存在很大的差异性。最后,考虑到评级机构与发债企业在选址上可能会有集聚效应,我们基于高铁开通事件进行双重差分检验,研究表明本文结论是稳健的。     

Rating Agency Reputation,the Global Financial Crisis,and the Cost of Debt

Why do foreign firms obtain credit ratings by global rating agencies rather than from their home country's rating agencies even though global raters typically assign lower credit ratings when these foreign firms issue bonds in their home currencies? We find that bonds rated by a global agency decreased yields 11‐14 basis points (bps) when compared to those rated by Japanese rating agencies but, during the 2007‐2009 financial crisis, the yields on these Japanese bonds increased 12‐17 bps, thus fully negating the advantage of obtaining a bond rating from a global rater. This suggests that the reputation of global rating agencies declined during the 2007‐2009 crisis period.     

Credit ratings and structured finance

The poor performance of credit ratings of structured finance products in the financial crisis has prompted investigation into the role of credit rating agencies (CRAs) in designing and marketing these products. We analyze a two-period reputation model in which a CRA both designs and rates securities that are sold both to investors who are constrained to purchase highly rated securities and investors who are unconstrained. Assets are pooled and senior and junior tranches are issued with a waterfall structure. When the rating constraint is lax, the CRA will include only risky assets in the securitization pool, serving both types of investors without any rating inflation. Rating inflation is decreasing in the tightness of the rating constraint locally. But rating inflation may be non-monotonic in the rating constraint globally, with no rating inflation when the constraint is lax or tight.     

Divergence in credit ratings

During the recent credit crisis credit rating agencies (CRAs) became increasingly lax in their rating of structured products, yet increasingly stringent in their rating of corporate bonds. We examine a model in which a CRA operates in both the market for structured products and for corporate debt, and shares a common reputation across the two markets. We find that, as a CRA’s reputation becomes good enough, it can be optimal for it to inflate its ratings with probability one in the structured products market, but inflate its ratings with probability zero in the corporate bond market.     

Intensified Competition and The Impact on Credit Ratings in the RMBS market

In this paper, we empirically investigate the impact of intensified competition on rating quality in the credit rating market for residential mortgage-backed securities (RMBS) in the period 2017–2020. We provide evidence that competition between large credit rating agencies (CRAs) (Moody's and Standard & Poor's) and newer smaller ones (Dominion Bond Rating Service Morningstar and Kroll Bond Rating Agency) creates credit rating inconsistencies in the RMBS market. While a credit rating should solely represent the underlying credit risk of a RMBS, irrespective of the competition in the market, our results show that this is not the case. When competitive pressure is higher, both large and small CRAs tend to adjust their rating standards (smaller CRAs react to large CRAs and vice versa).     

Sovereign credit rating determinants: A comparison before and after the European debt crisis

This paper compares the importance of different sovereign credit rating determinants over time, using a sample of 90 countries for the years 2002–2015. Applying the composite marginal likelihood approach, we estimate a multi-year ordered probit model for each of the three major credit rating agencies. After the start of the European debt crisis in 2009, the importance of the financial balance, the economic development and the external debt increased substantially and the effect of eurozone membership switched from positive to negative. In addition, GDP growth gained a lot of importance for highly indebted sovereigns and government debt became much more important for countries with a low GDP growth rate. These findings provide empirical evidence that the credit rating agencies changed their sovereign credit rating assessment after the start of the European debt crisis.     

A public good approach to credit ratings – From concept to reality

From the onset of the 2008–2009 financial crisis to the subsequent European sovereign debt crisis, credit rating agencies have been assigned considerable blame. Reforming the credit rating industry has hence become an important policy issue. In addition to the regulatory efforts in the context of accepting the for-profit business model of ratings, there is a growing realization that credit ratings bear the characteristics of a public good. Financial market participants need reliable, transparent and independent assessment of credit risks. Credit ratings are therefore better viewed as an infrastructure matter. However, the proposed regulations seem to have missed this point. This paper introduces a new approach to credit ratings undertaken by the Risk Management Institute at the National University of Singapore that is predicated on the provision of credit ratings as a public good. With a public good alternative in place, the currently predominant for-profit business model may be counterbalanced.     

Political similarities in credit ratings

We investigate whether political similarities between credit rating agencies (CRAs) and bond issuers impact credit rating quality. We find that a higher degree of similarity of political affiliation leads to a decrease in timeliness and accuracy of downgrades prior to default events. Our finding supports the notion that CRAs tend to maintain/assign preferential ratings to politically similar firms via delaying negative signals as favourable rating activities. We further show that these politically similar firms tend to increase the proportion of donations to their favoured party following favourable credit ratings. Interestingly, this result is confined to Republican-leaning firms. The results indicate that CRAs successfully use biased credit ratings as an indirect channel of political party support. Our findings support the political similarities in credit ratings hypothesis.     

Resaleable debt and systemic risk

Many debt claims, such as bonds, are resaleable; others, such as repos, are not. There was a fivefold increase in repo borrowing before the 2008–2009 financial crisis. Why? Did banks’ dependence on non-resaleable debt precipitate the crisis? In this paper, we develop a model of bank lending with credit frictions. The key feature of the model is that debt claims are heterogenous in their resaleability. We find that decreasing credit market frictions leads to an increase in borrowing via non-resaleable debt. Such borrowing has a dark side: It causes credit chains to form, because, if a bank makes a loan via non-resaleable debt and needs liquidity, it cannot sell the loan but must borrow via a new contract. These credit chains are a source of systemic risk, as one bank’s default harms not only its creditors but also its creditors’ creditors. Overall, our model suggests that reducing credit market frictions may have an adverse effect on the financial system and even lead to the failures of financial institutions.     

The impact of sovereign rating actions on bank ratings in emerging markets

This paper analyses the effects of sovereign rating actions on the credit ratings of banks in emerging markets, using a sample from three global rating agencies across 54 countries for 1999–2009. Despite widespread attention to sovereign ratings and bank ratings, no previous study has investigated the link in this manner. We find that sovereign rating upgrades (downgrades) have strong effects on bank rating upgrades (downgrades). The impact of sovereign watch status on bank rating actions is much weaker and often insignificant. The sensitivity of banks’ ratings to sovereign rating actions is affected by the countries’ economic and financial freedom and by macroeconomic conditions. Ratings of banks with different ownership structures are all influenced strongly by the sovereign rating, with some variation depending on the countries’ characteristics. Emerging market bank ratings are less likely to follow sovereign rating downgrades during the recent financial crisis period.     

When do stock analysts find bond rating changes informative?

Credit rating agencies (CRAs) have considerable privileged access to corporate management and are therefore a potentially important source of information to the equity market. We study how stock analysts incorporate bond ratings in their earnings forecasts. We develop an economic framework to explain why equity analysts might look to CRAs as an information source, especially after Regulation Fair Disclosure. Using this framework, we characterize the association between ratings changes and earnings forecast revisions surrounding these changes. We examine whether the extent to which equity analysts glean information from ratings changes is related to the extent and importance of information conveyed in the ratings change and analysts’ information uncertainty. We find that characteristics we examine are strongly related to stock analysts’ use of information in rating downgrades.     

Credit ratings quality: The perceptions of market participants and other interested parties

The global credit crunch of 2008 and related sub-prime mortgage crisis of 2007 have made credit ratings agencies (CRAs) the focus of international attention. In particular, the quality of ratings information and the responsibilities CRAs owe to financial markets have come under intense scrutiny. Specifically, commentators, politicians, and regulators have expressed concern at the involvement CRAs might have had in creating global financial instability. However, the term ratings quality remains largely absent from the academic literature.This paper constructs a measurement instrument to capture ratings quality provided by CRAs, and assesses differences in perceptions of ratings quality amongst four stakeholder groups in public debt markets. Two macro-constructs of ratings quality are identified, labelled Technical Qualities and Relationship Qualities. The two macro-constructs are measured by ten micro-attributes, labelled: Cooperation; Independence; Internal Processes; Issuer Orientation; Methodology; Reputation; Service Quality; Shared Values and Norms; Transparency; and Trust. Each micro-attribute is operationalised into individual items, and then empirically tested using data obtained in the UK from 121 issuers, 75 non-debt issuing financial managers, 90 investors, and 120 other interested parties.The data suggest that ratings quality involves, in order of importance: the CRA's reputation; those values and norms of the CRA shared by users; the methodologies employed by the CRA; the independence of the CRA; and internal processes within the CRA. Multivariate analysis of variance finds no statistically significant variation between the groups for Technical Qualities factors. However, issuers rate Relationship Qualities and its micro-attributes of Trust, Issuer Orientation, and Service Quality higher than other market participants; a finding that reflects the dyadic relationship between the issuer's treasurer and lead analyst of the CRA. The paper concludes with a number of policy-relevant issues.     

国家主权信用评级质量检验方法研究

国家主权信用评级对当今国际经济和金融运行有着极为重要的影响力。但是,与其地位不相符的是,评级机构的评级结果事后多次被证明准确性和前瞻性较差。事先缺乏预警而事后大幅降级,甚至对加剧危机起到了推波助澜的作用。本文从国家主权信用评级质量的检验方法入手,系统分析了违约率和迁移率等传统方法在检验评级结果起到的作用及其不足,给出了检验评级质量的一般方法,并验证了该评级检验方法的科学性和准确性。     

Testing the fire-sale FDI hypothesis for the European financial crisis

Using a panel of corporate transactions in 27 EU countries from 1999 to 2012, we investigate the impact of the financial crisis on the market for corporate assets. In particular, we test the ‘fire-sale FDI’ hypothesis by analyzing the number of cross-border transactions, the price of corporate assets and the impact of credit and macroeconomic conditions. According to the fire-sale FDI hypothesis, countries affected by a crisis attract foreign buyers selling assets at a discount. We find a dampening effect of the crisis on cross-border transactions in all EU countries. Although countries with higher sovereign default risk and lower economic demand attracted more foreign buyers in the crisis, lower domestic credit is associated with less cross-border transactions. Corporate assets in crisis countries are cheaper, particularly if domestic credit is low; however, these findings are not limited to the crisis period. This pattern is strikingly different from the East Asian and Latin American financial crises. Overall, we find little evidence for ‘fire-sale FDI’ suggesting an integrated European market without significant frictions.     

Looking Beyond Credit Ratings: Factors Investors Consider In Pricing European Asset‐Backed Securities

In this paper, we empirically investigate what credit factors investors rely upon when pricing the spread at issue for European asset‐backed securities. More specifically, we investigate how credit factors affect new issuance spreads after taking into account credit rating. We do so by investigating primary market spreads for tranches of non‐mortgage‐related asset‐backed securities issued from 1999 to the year prior to the subprime mortgage crisis, 2007. We find that although credit ratings play a major role in determining spreads, investors appear to not rely exclusively on these ratings. Our findings strongly suggest that investors do not ignore other credit factors beyond the assigned credit rating.     

Differences of opinion in sovereign credit signals during the European crisis

Motivated by the European debt crisis and the new European Union regulatory regime for the credit rating industry, we analyse differences of opinion in sovereign credit signals and their influence on European stock markets. Rating disagreements have a significant connection with subsequent negative credit actions by each agency. However, links among Moody’s/Fitch actions and their rating disagreements with other agencies have weakened in the post-regulation period. We also find that only S&P’s negative credit signals affect the own-country stock market and spill over to other European markets, but this is concentrated in the pre-regulation period. Stronger stock market reactions occur when S&P has already assigned a lower rating than Moody’s/Fitch prior to taking a further negative action.     

Combining accounting data and a structural model for predicting credit ratings: Empirical evidence from European listed firms

Ratings issued by credit rating agencies (CRAs) play an important role in the global financial environment. Among other issues, past studies have explored the potential for predicting these ratings using a variety of explanatory factors and modeling approaches. This paper describes a multi-criteria classification approach that combines accounting data with a structural default prediction model in order to obtain improved predictions and test the incremental information that a structural model provides in this context. Empirical results are presented for a panel data set of European listed firms during the period 2002–2012. The analysis indicates that a distance-to-default measure obtained from a structural model adds significant information compared to popular financial ratios. Nevertheless, its power is considerably weakened when market capitalization is also considered. The robustness of the results is examined over time and under different rating category specifications.     

法国中央银行信用评级体系的现实意义

本次金融危机暴露了现有国际评级体系的诸多缺点,为此,各国纷纷减少对三大国际信用评级机构的依赖,考虑逐步建立自己的评级体系。其中,法国中央银行信用评级体系以其悠久历史、26万家国内非金融企业的覆盖面、评级结果的客观有效而广受关注。文章考察了该评级体系的发展经验,比较了其与国际评级体系的差异,并介绍了其独特的基于专家评估的分析方法,以期为我国评级体系建设提供借鉴。