The European Commission has proposed establishing a framework that redirects capital to sustainable investments in order to foster sustainable economic growth. A key proposal from this framework is the mandatory consideration of environmental criteria for investment decisions. However, in particular for bond investors, there is not much academic guidance on how to integrate sustainability criteria in the investment process. Hence, this study investigates the impact of environmental sustainability on the pricing of credit risk for European corporations. Furthermore, whether or not the credit worthiness of a corporation has a moderating effect on the relationship between the environmental sustainability and the credit risk premium is analyzed. The findings prove that more sustainable companies have lower credit risk premiums if they also have a high credit worthiness.
The European Union (EU) wants to support the transition to a more sustainable economy in accordance with international agreements, e.g., the Paris Climate Agreement, the UN 2030 Agenda and the Sustainable Development Goals. Therefore, the EU is in the process of establishing a framework, which redirects capital to sustainable investments. The first key step is the creation of a unified classification system (“taxonomy”), new sustainable benchmarks and sustainability-related disclosure obligations for asset-managers. Furthermore, the EU plans to make it mandatory for asset managers to disclose whether and how they implement sustainability criteria in their investment processes. Even though the EU has a very comprehensive definition of sustainable investing, the main focus is on environmental issues, which includes minimizing green-house gas emissions, pollution and toxic waste as well as increasing the efficient use of natural resources (European Union 2019). So, investment professionals are faced with the challenge to find the best way to consider ecological criteria in their investment decisions.
The surge in academic studies covering the relationship between a company’s sustainable and financial performance should provide enough insights to find a good solution for this challenge. Unfortunately, over 85 percent of the studies investigating this relationship are equity-linked (Friede et al. 2015), although bonds have a market share of almost 40 percent of sustainable investments in Europe (Eurosif 2018). Furthermore, the studies covering the impact of sustainability on bonds partly contradict each other. Most studies suggest that sustainability has a positive impact on credit risk (Friede et al. 2015). For example, the study from Oikonomou et al. (2014) shows that good corporate social performance leads to lower bond yields and better credit ratings. These findings are confirmed by other studies, which focus on the impact of environmental sustainability on credit risk (e.g. Bauer and Hann 2010; Graham and Maher 2006; Schneider 2011) or environmental and social sustainability on credit risk (Dorfleitner et al. 2019). However, some studies indicate a neutral or negative impact from sustainability on credit risk. For instance, the findings from Menz (2010) indicate that socially responsible companies have higher risk premiums than non-socially responsible firms.
In order to give investment professionals more clarity on how to incorporate environmental sustainability criteria into their fixed income investment process as well as to contribute to the current academic discussion, we investigate if the environmental sustainability of a company effects its default risk premium. We further investigate whether a firm’s creditworthiness has a moderating effect on this relationship which could explain some of the different findings in the academic literature.
This study expands the existing body of research in three aspects. It is the first study in this field of research analyzing European corporations. This is of special interest due to the changing European regulatory framework which will force European investment firms to mandatorily disclose how they incorporate sustainability criteria in their investment process. Additionally, it is the first study to use credit default swap (CDS) spreads to measure credit risk in addressing the link between environmental sustainability and credit risk. The main advantage of using CDS spreads is that there is no need to correct for different maturities, coupon effects and other features, like optionality (Benkert 2004; Ericsson et al. 2009). Furthermore, this paper is the first that investigates the moderating effect of a company’s credit quality on the relationship between their environmental sustainability score and credit risk while covering firms from all industry sectors, except financials.
To provide a comprehensive analysis, a sample with yearly data from 149 companies for the period from 2006 to 2017 is considered. The findings of the whole sample show that companies with higher environmental sustainability have lower credit spreads. However, the results of the subsamples are more heterogenous and highlight that only companies with a high creditworthiness profit from being environmentally sustainable. Market participants only reward companies with a high creditworthiness for being more sustainable, whereas companies with a lower creditworthiness have almost no advantage from their sustainability efforts. This highlights the importance of a sophisticated assessment, when implementing sustainability criteria in the investment process. Investment professionals should always consider the moderating role of a firm’s creditworthiness in order to correctly assess the effect of sustainability on credit risk.
The remainder of this paper has the following structure: The next section presents the hypotheses development and gives a short review of the related literature. Chapter 3 explains the methodology and the data sample for the empirical analysis. This section is followed by the description of the main findings. Finally, this paper concludes with a short summary of the empirical results and an outlook on further research needs.
Hypothesis development and related literature
The default risk of a company could be negatively affected by a lack of environmental sustainability via four interconnected transmission channels. First, companies with a higher environmental sustainability have less regulatory risks because they have a lower probability of being fined for environmental misconduct and they are better prepared to adopt any regulatory changes regarding environmental issues. For example, the US Environmental Protection Agency (EPA) enforced private parties to spend over USD 450 million to cleanup Superfund sites in fiscal year 2018 (EPA 2019). Similar to the US Superfund, the EU put the Environmental Liability Directive (ELD) into force to prevent and remedy environmental damage based on the “polluter-pays” principle. This directive, which is enforced by the particular member states, is one European regulation that makes companies liable for the environmental damage they have caused (European Union 2006). Additionally, stricter regulations can be expected based on the Sustainable Development Strategy (SDS) of the European Union (European Union 2019). The implementation of these new regulations could pose a major challenge to environmental sinners and increase their compliance costs. In summary, the companies with lower environmental sustainability have a higher regulatory risk due to potentially higher fines as well as a slower and more costly adaption of upcoming regulatory changes which are expected to increase their default risk.
Second, companies with a lower environmental sustainability face higher stakeholder and reputational risks. The perception of environmental issues has changed leading to an increased public awareness and media coverage (Leiserowitz et al. 2018). Hence, many customers have become more sensitive to ecological issues and punish environmental misconduct by avoiding products from environmentally unfriendly companies, which can lead to a severe reduction in sales and harm profits. Additionally, other companies do not want to be associated with environmental sinners and thus are likely to cut off business dealings with polluters, which could have a negative impact on the whole supply chain. Bauer and Hann (2010) demonstrate that a deterioration of stakeholder relationships directly affects the cash flow, which influences both the firm value and the default risk.
Third, companies, which are involved in environmental issues, have a higher financial risk, because many investors start to integrate sustainability criteria in the investment process and thus either refuse to invest in those companies or demand a higher risk compensation. The EU plans to reinforce this development by introducing the EU taxonomy,Footnote 1 sustainability-related disclosure for investment products and alternative sustainable benchmarks (European Union 2019). This is likely to redirect capital to more sustainable firms and thus lead to a further increase in refinancing costs for less sustainable companies. Additionally, banks and credit rating agencies start to incorporate sustainability criteria in their credit risk assessment process (Fitch Ratings 2019; Goss and Roberts 2011; Weber et al. 2008, 2010). Hence, less sustainable companies are likely to face higher refinancing costs for both loans and bonds if they receive lower credit ratings from banks and rating agencies, respectively. This will not only increase funding costs but also constrain access to sufficient funding sources in times of financial distress.
Fourth, companies, which are less sustainable, in particular in regard to environmental factors, have higher event risks. The Exxon Valdez (1985), BP (2010), Tepco (2011) and Vale (2019) catastrophes are a few examples that highlight the effect of environmental disasters on the creditworthiness of a company. For instance, the most recent disaster was the burst of Vale’s dam in Brazil which led to the death of at least 248 people. Besides destroying the surrounding area, the whole ecosystem is now contaminated by metals which were released after the dam burst. As a result, Vale’s stock price fell 24 percent after the catastrophe and their credit rating was reduced by Fitch to BBB. Furthermore, it significantly deteriorated their relationship with many stakeholders and will probably lead to stricter regulations. Vale could have prevented a decline in their creditworthiness, the deterioration of its stakeholder relationships and stricter regulations by better managing their environmental risks. The event risks that emerge from questionable business practices can lead to immense liabilities, which often question the continuation of the business and thus increase the default risk.
In summary, the higher regulatory, reputational, financial and event risk of companies with a lower environmental sustainability score is expected to negatively affect the creditworthiness of the respective company. Hence, our first hypothesis is as follows:
Companies with higher environmental sustainability have lower credit risk premiums.
The previously outlined risk-mitigation view, which states that higher sustainability leads to lower default risk, is widely held by researchers and investment professionals (e.g. Bauer and Hann 2010; Dorfleitner et al. 2019; Schneider 2011). However, some argue that investments in sustainability are a waste of scarce resources, which could be better spent by investing in the expansion of the firm or paying dividends. In accordance with this overinvestment view, the credit risk premia for more sustainable companies should be higher (e.g. Menz 2010). We hypothesize that companies with a high creditworthiness have more financial scope and are thus able to afford being “green.” For them, the risk reduction effect from being sustainable overcompensates the additional costs. Furthermore, companies with a low creditworthiness have less financial scope, which makes it more difficult for them to direct their few resources towards sustainable development. Moderating effects could provide a link between the risk-mitigation view and the overinvestment view, as shown by Stellner et al. (2015) for the moderating effect of country sustainability on the relationship between credit risk and sustainability on company level. Based on these considerations, our second hypothesis is as follows:
Only companies with a high creditworthiness profit from a high environmental sustainability.
The first study regarding the effect of environmental sustainability on credit risk was conducted by Graham et al. (2001), who show that off-balance-sheet environmental obligations have a negative impact on bond ratings. Graham and Maher (2006) confirm these results and extend the previous work by investigating the impact of environmental liability information on bond yields. Their findings indicate that environmental obligations are accounted for in bond yields. However, the environmental liability information has no additional explanatory power if bond ratings are also considered in the model. The study from Schneider (2011) focusses on firms in the pulp and paper as well as chemical industry and highlights that poor environmental performance has a negative impact on bond pricing. Additionally, Bauer and Hann (2010) confirm the positive impact of good environmental management on bond ratings and yield spreads. However, their results indicate that there is no general industry or sector level effect moderating the effect of sustainability on credit risk due to the high heterogeneity of firms within these sectors. The most recent study in this field of research was conducted by Dorfleitner et al. (2019) which concludes that considering social and environmental criteria improves the prediction of credit ratings and that firms with a higher social or environmental sustainability receive better credit ratings. Additionally, we review the literature on green bonds, which are attracting growing investor interest. Hachenberg and Schiereck (2018) show that green bonds have a lower credit risk premium, which could be economically important, even though their results are often not statistically significant. In summary, the current literature regarding the impact of environmental sustainability on credit risk supports our first hypothesis.
In contrast, the moderating effect of creditworthiness on the impact of sustainability on credit risk is hardly analyzed by academics. Moreover, the few existing studies contradict each other. For instance, the findings of Schneider (2011) highlight that the effect of environmental sustainability on credit risk is more positive for U.S. companies from the pulp and paper as well as chemical industry if they have lower credit ratings. Goss and Roberts (2011) analyze loans from U.S. banks and investigate the impact a firm’s investment in corporate social responsibility (CSR) has on its loan spreads. Their results contradict the findings from Schneider (2011), when they conclude that low-quality borrowers face higher refinancing costs if they invest in discretionary CSR.
To the best of our knowledge, this is the first study that analyzes the impact of environmental sustainability on credit risk for European companies using CDS spreads and investigates the moderating effect of creditworthiness while incorporating all industry sectors, except the financial sector, with an extensive sample ranging from 2006 to 2017.
Data and methodology
The starting point for the sample is the MSCI Europe Index, which includes more than 400 European firms. For this study financial firms are excluded from the sample for two reasons. First, companies from the financial sector have no essential impact on the environment and thus exhibit low direct environmental risks. They mainly face indirect environmental risks due to their loan portfolios, which have to be assessed differently.Footnote 2 Second, credit risk models differ for financial and nonfinancial firms. For that reason, most studies regarding credit risk focus on companies from industrial sectors (e.g. Bai and Wu 2016; Ericsson et al. 2009). Additionally, all firms without a quoted CDS spread and sustainability data were excluded from the sample. So, the final sample comprises 149 European companies in the period from 2006 to 2017 based on yearly data.
In this study, CDS spreads are used instead of bond spreads to measure the default risk premium. There are three main advantages of using CDS spreads. First, CDS prices reflect changes in the firm-specific fundamental data faster and more accurately than bond prices, which tend to follow the CDS market (Blanco et al. 2005). Second, CDS is a pure measurement of credit risk. Hence, the CDS premium does not have to be separated into a term structure, credit risk and liquidity risk premium. Third, when CDS is used instead of bonds, it is not necessary to account for different and varying maturities due to their fixed tenor (Bai and Wu 2016; Ericsson et al. 2009). In accordance with Bai and Wu (2016), we use the natural logarithm of the CDS premium to accounted for variable skewness and to receive a better distributional behavior.
Based on prior studies, both fundamental and stock market data are used with the sustainability factor to explain the default risk premium of companies. In more detail, the fundamental data used in this study are leverage, profitability and market capitalization. Leverage, an indicator for the indebtedness of a company, is derived by dividing the total debt of a firm by its total assets. In accordance with the structural framework developed by Merton (1974), the distance-to-default shrinks if the leverage rises which ultimately leads to an increased default probability. In this framework, the default of a company is triggered if it has more debt than assets, which would be equal to a leverage ratio greater than 1. Hence, companies with higher leverage have to pay higher risk premiums due to a higher default risk (Bai and Wu 2016; Collin-Dufresne et al. 2001). Profitability is measured by earnings before interest and taxes (EBIT) divided by the total assets. This figure should have a negative effect on the default risk because companies with higher earnings are more likely to repay their debt and thus less likely to default (Bai and Wu 2016; Benkert 2004). The last fundamental firm-specific variable is market capitalization,Footnote 3 which is derived by multiplying a company’s outstanding shares with its share price. Larger firms should have more financial flexibility than smaller firms which is why market capitalization is expected to also have a negative relationship with the default risk (Bai and Wu 2016; Du and Suo 2007; Shumway 2001).
In addition, two variables derived from the stock market are taken into account to explain the CDS prices. The first variable is the return of a company’s stock measured as the annualized return of the stock during the last 180 trading days. Duffie et al. (2007) suggest in their study that a higher stock return leads to a lower credit risk premium. The other variable is the annualized volatility of a firm’s stock, which is based on the daily stock returns of the last 180 trading days. In light of the structural framework, a firm’s bond can be regarded as a short put option on the stock of the company whose value increases if the volatility of the respective stock increases (Campbell and Taksler 2003; Collin-Dufresne et al. 2001; Merton 1974). Thus, a higher stock volatility should be accompanied by a higher credit risk premium.
The environmental rating from MSCI is used in this study.Footnote 4 This score measures the environmental sustainability of a company with a score ranging from 0 to 10, whereby a higher score indicates a higher level of sustainability. The assessment of a company’s environmental sustainability covers several key ecological issues with regard to climate change, natural resources, pollution and waste and environmental opportunities. Moreover, this sustainability rating takes the management of sustainability related risks as well as the exposure of the firm to those risks into account and weights the respective scores based on a firms’ risk exposure (MSCI ESG Research 2018). Hence, the environmental score from MSCI is a very comprehensive assessment of the sustainability risks and opportunities a company faces. In accordance with our first hypothesis, we expect higher environmental sustainability to lead to lower CDS premiums due to less regulatory, reputational, financial and event risk.
All variables used in the regression are summarized in Table 1, which contains their abbreviations, short descriptions and the data source.
The following model uses a random-effects estimatorFootnote 5 with both time and individual dummies to account for unobserved time-variant and time-invariant effects. Additionally, time-clustered White standard errorsFootnote 6 are reported to correct for heteroscedasticity and serial-correlation. The model is summarized in the following equitation:
Similar to the methodology from Akdoğu and Alp (2016), subsamples are created to test for possible moderating effects by the creditworthiness of a firm. In order to analyze the effect of a firm’s solvency, the subsamples are created based on the worst credit rating of each company assigned by Moody’s, S&P or Fitch. All of the corporations with a rating above the median rating are part of the good credit quality sample and vice versa. Additionally, three subsamples are built with the same sampling routine based on leverage, profitability and market capitalization. This process is repeated yearly to account for changes in the creditworthiness of the companies over time.
In this section, we provide a detailed overview of our results for each hypothesis. First, the impact of the control variables on the CDS spread is discussed for every sample. After that, the general impact of environmental sustainability and the moderating effect of creditworthiness is analyzed. The results for the whole sample as well as for the respective subsamples are summarized in Table 2.
With two exception, all the control variables based on the stock market have the expected impact on the CDS spread, though only the effect of the stock volatility is significant. These results are logical in view of the structural framework because a bond has limited upside and unlimited downside potential. Hence, bond investors focus more on the possible losses, for which the stock volatility is a better estimator. Moreover, volatility is especially important for firms with a high leverage. This is plausible with regard to Merton’s structural framework, as well, because a high leverage is associated with a low distance-to-default which reinforces the effect of the stock volatility.
The fundamental variables have the expected effect on the CDS spread as well. Both profitability and market capitalization have a negative effect on the CDS premium. That means, companies that are more profitable and have a higher market capitalization have a lower credit risk. Furthermore, profitability seems to be particularly crucial for companies with a high creditworthiness. Thus, investors view profitability as the more important factor when distinguishing between firms with an already good solvency. The last control variable is leverage which also has the expected impact on the CDS premiums. In all samples, a higher leverage leads to an increase in the default risk premium.
The findings based on the whole sample show that the environmental factor has a negative impact on the CDS spread. Hence, firms with a higher environmental sustainability have, in general, lower CDS spreads.
This finding supports our first hypothesis, which stated, with regard to the risk-mitigation view, that more sustainable firms have a lower default probability and have to pay less for their debt due to lower regulatory, reputational, financial and event risks. For instance, companies that increase their environmental score by 1 point can decrease their CDS spread by 1.8 percent. Thus, a company that has a CDS spread of 122.9 bp, which is the average CDS premium of the whole sample, can decrease their CDS spread by 2.1 bp by increasing their environmental score by 1 point.
After analyzing the general impact of environmental sustainability on CDS spreads, we elaborate on the potential moderating effect of a company’s credit quality. Even though the effect of environmental sustainability remains negative, irrespective of the subsample, the magnitude of the effect varies notably between the different samples. For example, environmental sustainability has almost no effect on companies with a low credit rating. In contrast, environmental sustainability has a big influence on the credit risk premium of companies that have high credit ratings and good creditworthiness. Moreover, the effect is strong for companies with a low leverage and high market capitalization, whereas it does not pay of to be green for small and indebted companies, though they do not incur a penalty for being sustainable. Profitability is the only variable that does not affect the impact of sustainability on CDS premiums. The impact on firms with either a high or low profitability is almost the same and, in both cases, not statistically significant. A reason for this result could be that leverage and market capitalization are more important indicators for a firm’s ability to fund its sustainable development. So, if a firm has a high leverage or a low market capitalization, the investors prefer paying debt off or retaining the earnings to investing in the environmental sustainability, irrespective of the profitability. In particular, the results for the subsamples based on the credit ratings confirm our second hypothesis and show that only companies with a high creditworthiness profit from a high environmental sustainability.
In this paper we analyzed, whether environmental sustainability has an effect on the credit risk of European nonfinancial companies to help investors making sound decisions, when incorporating sustainability into their investment process. This topic is expected to gain even more importance in view of the upcoming EU directives based on their sustainable development strategy, which will directly affect both asset owners and investment managers.
In general, the findings show that more sustainable companies have a lower credit risk due to lower reputational, financial, regulatory and event risks, which provides proof for our first hypothesis and the risk-mitigation view. Furthermore, our findings indicate that a company’s creditworthiness moderates the impact of environmental sustainability on credit risk. It appears that only companies with high creditworthiness benefit from having a high environmental sustainability score, though companies with a low creditworthiness do not incur a penalty for being sustainable.
Therefore, investment professionals should integrate environmental criteria into the assessment of a company’s default risk and consider the moderating effect of a firm’s creditworthiness. This integration should improve existing credit models and lead to a slightly more precise valuation of credit risk.
Further research should expand this study by analyzing the impact of sustainability on the credit risk of companies which have a sub-investment grade credit rating or are from emerging market countries because investors tend to shift their assets into these asset classes in a search for yield and need precise valuation models, which incorporate sustainability data. Additionally, the impact of the new EU regulations on the pricing and allocation of loans could be further investigated to better understand whether the perception of environmental risks within the credit portfolios of banks and other financial firms is changing.
The EU taxonomy is a classification system for sustainable activities which aims to provide guidance for policy makers, industry and investors on how to best support and invest in economic activities that contribute to achieving a climate neutral economy.
The impact of environmental sustainability on the credit risk of loans has been investigated by, for example, Weber et al. (2010).
Similar to the CDS, the natural logarithm of the market capitalization is used in the regression to account for skewness.
The Breusch–Pagan test and the Breusch–Godfrey/Wooldridge test indicated heteroscedasticity and serial-correlation, respectively. Hence, time clustered White standard errors are used to account for both heteroscedasticity and serial-correlation.
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Höck, A., Klein, C., Landau, A. et al. The effect of environmental sustainability on credit risk. J Asset Manag 21, 85–93 (2020). https://doi.org/10.1057/s41260-020-00155-4