The leverage effect puzzle: the case of European sovereign credit default swap market

One of the stylized facts about the behaviour of time series is that their volatility exhibits asymmetrical responses to good and bad news. In the case of stock markets, volatility seems to rise when the stock price decreases and fall when the stock price increases. This so-called “leverage effect” was first described by Black (Proceedings of the 1976 meeting of the business and economic statistics section, pp 177–181, 1976). The concept is not new and has already been comprehensively studied and implemented in many volatility models (GARCH and SV) in the form of an additional parameter in the volatility equation. However, there is no study or a theoretical explanation of the leverage effect in sovereign credit default swap spreads (hereinafter: sCDS). In this article, we discuss the possible behaviour of sCDS volatility and explain it by way of reference to the Prospect Theory by Kahneman and Tversky (Econometrica 47(2):263–292, 1979). We estimate a series of stochastic volatility models with the leverage effect, proposed by Yu (J Econom 127(2):165–178, 2005). In this model, the “leverage effect” is, in fact, the same as a coefficient of the correlation between the current return of an asset and its expected future volatility. We show that the effect does exist and differs across markets. As far as the safe European markets are concerned, the parameter is negative; in the case of extremely risky economies—it is positive. In markets of medium risk the effect varies depending on the relationship between the perceived risk and the value of the sCDS premium.     

Negative Libor rates in the swap market model

We apply Stroock and Varadhan’s support theorem to show that there is a positive probability that within the Swap Market Model the implied Libor rates become negative in finite time. Mataix-Pastor received support from the Instituto Credito Oficial (ICO), Spain, and Fundación Caja Madrid.     

Network structures and idiosyncratic contagion in the European sovereign credit default swap market

This study combines conditional Granger causality and network analysis to examine the interconnectedness in the European sovereign credit default swap (CDS) market. We determine that the network is unstable in the short term and stable in the long term. Further, we visualize dynamic networks and confirm financial contagion in the 2012 European debt crisis. The sources of risk spillovers and the manner in which spillovers are transferred among countries are identified accordingly. Further, we conclude that interconnectedness can be a pricing factor for determining the sovereign CDS return. The results of the network analysis indicate that the European sovereign CDS market is a complex network system and can serve as a valuable reference for investors and policymakers.     

The reaction of emerging market credit default swap spreads to sovereign credit rating changes

This paper examines the effect of sovereign credit rating change announcements on the CDS spreads of the event countries, and their spillover effects on other emerging economies’ CDS premiums. We find that positive events have a greater impact on CDS markets in the two-day period surrounding the event, and are more likely to spill over to other emerging countries. Alternatively, CDS markets anticipate negative events, and previous changes in CDS premiums can be used to estimate the probability of a negative credit event. The transmission mechanisms for positive events are the common creditor and competition in trade markets.     

Factor decomposition of the Eurozone sovereign CDS spreads

In the present study, we examine the factors driving Eurozone sovereign credit default swap (CDS) spreads during the Eurozone sovereign debt crisis. For identifying factors we utilize independent component analysis (ICA), a technique similar to principal component analysis (PCA). We identify three factors that impact spreads and capture the features specific to the crisis such as the breakup risk of the Eurozone: peripheral factor, global factor, and Eurozone common factor. In contrast, when PCA is applied, only a single factor is identified. Moreover, using ICA with a GARCH model, we show that the source of volatility for CDS spreads shifted from the global factor in 2009 and the peripheral factor in 2010 to the Eurozone common factor in 2012, and that the dynamic correlation reflects the decoupling between low credit risk countries such as Germany and high credit risk countries such as Greece. We also show that the goodness-of-fit of the ICA-based model is better than other models used such as the Student's t copula model.     

Determinants of the bid-to-cover ratio in Eurozone sovereign debt auctions

Building on a unique dataset of Eurozone sovereign debt auctions, this paper analyzes the determinants of their bid-to-cover ratios, which is the most common measure of the outcome of an auction. We find that the secondary market yield on the same maturity instrument, past domestic and foreign bid-to-cover ratios and occasionally the number of primary dealers tend to exert a positive effect on the current bid-to-cover ratio, while the opposite is the case for the supply and the volatility of the yield. The results thus suggest that past information helps to predict the demand in auctions.     

Positive asymmetric information in volatile environments: The black market dollar and sovereign bond yields in Venezuela

PurposeWe test the informational efficiency of Venezuelan USD sovereign bond yields when the black market exchange-rate premium (BMERP) changes.DesignWe use a non-parametric, asymmetric, Granger causality test to test our hypothesis.FindingsWe find that the bond market with less than or equal to 5 years of maturity seems to be efficient when good news is released on the BMERP. However, this market is not informationally efficient, and when combined with unbiased bad news regarding the BMERP, arbitrage opportunities are created.Originality/valueCapital controls that restrict free exchange-rate mechanisms create arbitrage opportunities with negative news as opposed to positive news.     

欧元区国债强制引入集体行动条款的可能影响及启示

自2013年1月1日起,欧元区各国新发行且期限超过一年的国债,必须引入集体行动条款（CACs）。文章介绍分析了欧元区国债引入CACs条款的历程、CACs条款主要内容,多角度分析了其相关影响。文章指出,此次欧元区国债强制引入CACs条款,开启了发达国家大规模引入该条款先例,对债券市场特别是欧元区国债投融资可能产生重要影响,如未来出现重组,欧央行及成员国央行均可能出现损失。     

Determinants of sovereign yield spreads in the Eurozone: A Bayesian approach

We analyze the determinants of sovereign yields spreads of EMU member states applying Bayesian Model Averaging (BMA) to annual panel data from 1999 to 2009. BMA is well-suited in cases of small samples and high model uncertainty. This seems to be the case in modeling sovereign yield spreads in the Eurozone since the literature reports heterogeneous results with respect to significant explanatory variables. We are testing a number of variables reported to be significant in the literature and find that the most likely country specific drivers of yield spreads are fiscal variables such as budget balance and government debt, as well as external sector variables, such as terms of trade, trade balance and openness. Global financing conditions, indicated by the US interest rate, and market sentiments, indicated by corporate bond spreads, are likely to influence sovereign yield spreads.     

A sovereign risk index for the Eurozone based on stochastic dominance

We propose a new method to assess sovereign risk in Eurozone countries using an approach that relies on consistent tests for stochastic dominance efficiency. The test statistics and the estimators are computed using mixed integer programming methods. Our analysis is based on macroeconomic fundamentals and their importance in accounting for sovereign risk. The results suggest that net international investment position/GDP and public debt/GDP are the main contributors to country risk in the Eurozone. We also conduct ranking analysis of countries for fiscal and external trade risk. We find a positive correlation between our rankings of the most vulnerable countries and the S&P’s ratings, whereas the correlation for other countries is weaker.     

The stability of short-term interest rates pass-through in the euro area during the financial market and sovereign debt crises

We analyse the dynamics of the pass-through of banks’ marginal cost to bank lending rates over the 2008 crisis and the euro area sovereign debt crisis in France, Germany, Greece, Italy, Portugal and Spain. We measure banks’ marginal cost by their rate on new deposits, contrary to the literature that focuses on money market rates. This allows us to account for banks’ risks. We focus on the interest rate on new short-term loans granted to non-financial corporations in these countries. Our analysis is based on an error-correction approach that we extend to handle the time-varying long-run relationship between banks’ lending rates and banks’ marginal cost, as well as stochastic volatility. Our application is based on a harmonised monthly database from January 2003 to October 2014. We estimate the model within a Bayesian framework, using Markov Chain Monte Carlo methods (MCMC).We reject the view that the transmission mechanism is permanent over time. The long-run relationship moved with the sovereign debt crises to a new one, with a slower pass-through and higher bank lending rates. Its developments are heterogeneous from one country to the other. Impediments to the transmission of monetary rates depend on the heterogeneity in banks marginal costs and therefore, its risks. We also find that rates to small firms increase compared to large firms in a few countries. Using a VAR model, we show that overall, the effect of a shock on the rate of new deposits on the unexpected variances of new loans has been less important since 2010. These results confirm the slowdown in the transmission mechanism.     

关于欧洲主权债务问题与欧元区域制度改革的思考

近来,希腊、葡萄牙、西班牙和爱尔兰等多个欧元区国家均面临主权债务违约风险。这一问题的发生,既有希腊等国自身财政管理的原因,也反映出欧元区体制中存在的一系列长期性、结构性和制度性问题。如果不能妥善解决欧元区国家的主权债务问题,不仅将拖累欧元区经济发展,也会对世界经济金融复苏造成冲击。欧洲主权债务问题的出现,对我国财政预算管理也有一定警示作用。     

News spillovers in the sovereign debt market

We study the effect of a sovereign credit rating change of one country on the sovereign credit spreads of other countries from 1991 to 2000. We find evidence of spillover effects; that is, a ratings change in one country has a significant effect on sovereign credit spreads of other countries. This effect is asymmetric: positive ratings events abroad have no discernable impact on sovereign spreads, whereas negative ratings events are associated with an increase in spreads. On average, a one-notch downgrade of a sovereign bond is associated with a 12 basis point increase in spreads of sovereign bonds of other countries. The magnitude of the spillover effect following a negative ratings change is amplified by recent ratings changes in other countries. We distinguish between common information and differential components of spillovers. While common information spillovers imply that sovereign spreads move in tandem, differential spillovers are expected to result in opposite effects of ratings events across countries. Despite the predominance of common information spillovers, we also find evidence of differential spillovers among countries with highly negatively correlated capital flows or trade flows vis-á-vis the United States. That is, spreads in these countries generally fall in response to a downgrade of a country with highly negatively correlated capital or trade flows. Variables proxying for cultural or institutional linkages (e.g., common language, formal trade blocs, common law legal systems), physical proximity, and rule of law traditions across countries do not seem to affect estimated spillover effects.     

Asymmetric dynamics in correlations of treasury and swap markets: Evidence from the US market

Using the asymmetric dynamic conditional correlation (A-DCC) model developed by Cappiello et al. (2006), this paper empirically analyzes the conditional correlation between treasury and swap markets from February 9, 2006 to May 31, 2011, and makes two key contributions. First, the dynamics of the conditional correlation of only the 2-year maturity differs from those of other maturities. These patterns might be explained by the fact that a 2-year maturity is easily affected by market forecasts of monetary policy changes by the Federal Reserve Board. Second, the financial crisis dummies (ξ₁) are all negative in particular with significance at the 5% level for 7 year, 10 year, and 30 year maturities. This result indicates that arbitrage transactions between treasuries and swaps have not taken place on a sufficient scale during the financial crisis period. As Ito (2010) points out, market participants have been uncertain about the direction of the monetary policies of these financial institutions.     

Bank use of sovereign CDS in the Eurozone crisis: Hedging and risk incentives

Using a comprehensive dataset from German banks, we document the usage of sovereign credit default swaps (CDS) during the European sovereign debt crisis of 2008–2013. Banks used the sovereign CDS market to extend, rather than hedge, their long exposures to sovereign risk during this period. Lower loan exposure to sovereign risk is associated with greater protection selling in CDS, the effect being weaker when sovereign risk is high. Bank and country risk variables are mostly not associated with protection selling. The findings are driven by the actions of a few non-dealer banks which sold CDS protection aggressively at the onset of the crisis, but started covering their positions at its height while simultaneously shifting their assets towards sovereign bonds and loans. Our findings underscore the importance of accounting for derivatives exposure in building a complete picture and understanding fully the economic drivers of the bank-sovereign nexus of risk.     

The impact of distressed economies on the EU sovereign market

Financially distressed economies inside the European Union (EU) are being blamed for producing a general increase in borrowing costs. This article analyzes the channels of default risk transmission within the EU countries using the information content in the sovereign Credit Default Swap (CDS) market. We proceed in two directions. First, we test the existence of cross-border volatility effects between the central and the peripheral EU countries. Second, we explore the effect of distressed economies on the default and risk premium constituents of sovereign default swaps. We show a significant volatility spillover from distressed to central European Economic and Monetary Union (EMU) economies. This causality pattern leads to a significant impact on the default swap risk premia. On average, the risk premium accounts for approximately 42% of central EMU spreads and 56% of the spreads for those countries outside of the EMU. The peripheral risk also affects the default component of central economies, although its impact is lower.     

Liquidity and credit premia in the yields of highly-rated sovereign bonds

This paper quantifies liquidity and credit premia in German and French government bond yields. For this purpose, we estimate term structures of government-guaranteed agency bonds and exploit the fact that differences in their yields vis-à-vis government bonds are mainly driven by liquidity effects. Adding information on benchmark rates, we estimate liquidity and credit premia as latent factors in a state-space framework. The results allow us, first, to quantify the price impact of safe-haven flows on sovereign yields, which strongly affected very liquid bond markets during the recent financial crisis. Second, we quantify credit premia for highly rated governments, offering an important alternative to the information based on CDS markets.     

The sovereign ceiling and emerging market corporate bond spreads

We use the spreads of emerging market bonds traded in secondary markets to study investors' perception of country risk. Specifically, we ask whether investors apply the “sovereign ceiling,” which says that no firm is more creditworthy than its government. To do this we compare the spreads of bonds issued by firms to those of bonds issued by the firms' home governments. We find several cases where a firm's bond trades at a lower spread than that of the firm's government, indicating that investors do not always apply the sovereign ceiling. Bonds for which this is true tend to have substantial export earnings and/or a close relationship with either a foreign firm or with the home government.     

Implied liquidity risk premium in the term structure of sovereign credit default swap and bond spreads

In this study, we focus on the dynamic properties of the risk-neutral liquidity risk premium specific to the sovereign credit default swap (CDS) and bond markets. We show that liquidity risk has a non-trivial role and participates directly to the variation over time of the term structure of sovereign CDS and bond spreads for both the pre- and crisis periods. Secondly, our results indicate that the time-varying bond and CDS liquidity risk premium move in opposite directions which imply that when bond liquidity risk is high, CDS liquidity risk is low (and vice versa), which may in turn be consistent with the substitution effect between CDS and bond markets. Finally, our Granger causality analysis reveals that, although the magnitude of bond and CDS liquidity risk is substantially different, there is a strong liquidity flow between the CDS and the bond markets, however, no market seems to consistently lead the other.     

Economic policy uncertainty and sovereign credit rating decisions: Panel quantile evidence for the Eurozone

We employ a panel quantile framework that quantifies the relative importance of quantitative and qualitative factors across the conditional distribution of sovereign credit ratings in the Eurozone area. We find that regulatory quality and competitiveness have a stronger impact for low rated countries whereas GDP per capita is a major driver of high rated countries. A reduction in the current account deficit leads to a rating or outlook upgrade for low rated countries. Economic policy uncertainty impacts negatively on credit ratings across the conditional distribution; however, the impact is stronger for the lower rated countries. In other words, the creditworthiness of low rated countries takes a much bigger ‘hit’ than that of high rated countries when European policy uncertainty is on the rise.