2018, Gyntelberg, Jacob, Hördahl, Peter, Ters, Kristyna, Urban, Jörg

The sovereign debt crisis in the euro area saw credit spreads on sovereign bonds and credit default swaps (CDS) surge for a number of member states. The rise in sovereign yields was accompanied by a significant increase in sovereign CDS market activity. This pattern raised concerns that destabilising speculation via outright short-selling of CDS (so-called ‘naked CDS’) was behind the increase in bond yields. In response, policy-makers introduced a ban on naked CDS trading. We investigate the effect of the ban on the price discovery process of sovereign credit risk, contrasting results for the post-ban period with those obtained prior to the ban. We use intraday data on sovereign CDS and bonds across a number of euro area countries. Our first main finding is that the CDS market dominates the bond market in terms of price discovery. That is, CDS premia in most cases adjust quicker to reflect new information than bond spreads. This result holds also when taking into account transaction costs. Our second main finding is that the ban on short-selling did not alter price discovery dynamics or reduce the efficiency of the market. Finally, we find that prior to the ban, CDS spreads were persistently higher than bond credit spreads, even after controlling for transaction costs. This points to the presence of market frictions that limit the ability of arbitrage forces to fully close pricing gaps between the two markets. However, these pricing discrepancies were in many cases largely eliminated following the introduction of the ban.

2017-04-26, Ters, Kristyna, Gyntelberg, Jacob, Hoerdahl, Peter, Urban, Jörg

We find evidence that in the market for euro area sovereign credit risk, arbitrageurs engage in basis trades between credit default swap (CDS) and bond markets only when the CDS-bond basis exceeds a certain threshold. This threshold effect is likely to reflect costs that arbitrageurs face when implementing trading strategies, including transaction costs and costs associated with committing balance sheet space for such trades. Using a threshold vector error correction model, we endogenously estimate these unknown trading costs for basis trades in the market for euro area sovereign debt. During the euro sovereign credit crisis, we find very high transaction costs of around 190 basis points, compared to around 80 basis points before the crisis. Our results show, that even when markets in times of stress are liquid, the basis can widen as high market volatility makes arbitrage trades riskier, leading arbitrageurs to demand a higher compensation for increased risk. Our findings help explain the persistent non-zero CDS-bond basis in euro area sovereign debt markets and its increase during the last sovereign crisis.

2016-06, Ters, Kristyna, Komarek, Lubos, Urban, Jörg

We examine the role of the CDS and bond markets during and before the recent euro area sovereign debt crisis as transmission channels for credit risk contagion between sovereign entities. We analyse an intraday dataset for GIIPS countries as well as Germany, France and central European countries. Our findings suggest that, prior to the crisis, the CDS and bond markets were similarly important in the transmission of sovereign risk contagion, but that the importance of the bond market waned during the crisis. We find flight-to-safety effects during the crisis in the German bond market that are not present in the pre-crisis sample. Our estimated sovereign risk contagion was greater during the crisis, with an average timeline of one to two hours in GIIPS countries. By using an exogenous macroeconomic news shock, we can show that, during the crisis period, increased credit risk was not related to economic fundamentals. Further, we find that central European countries were not affected by sovereign credit risk contagion, independent of their debt level and currency.

2018, Ters, Kristyna, Urban, Jörg

With the onset of the euro area sovereign debt crisis, the CDS spreads of the Czech Republic, Hungary, Poland and Slovakia (the Visegrad group) increased even though the Visegrad group maintained solid public finances and ratings on average. Real economic linkages such as trade between the Visegrad group as important trading partner to the GIIPS countries might have led to this increase in sovereign credit risk due to contagion during the sovereign debt crisis period. We aim to analyse whether contagion led to higher sovereign risk in the Visegrad group and furthermore, whether the economic adjustment programmes (EAPs) by the Troika have been able to stabilise and reduce sovereign risk. We analyse 30-min intraday credit default swaps (CDS) data prior to the sovereign debt crisis period (2008–Oct. 2009) and during the sovereign debt crisis period (Oct. 2009–2011). By using a panel VAR methodology we find rather comovement effects in the Visegrad group member countries as they have been only marginally affected by the turmoil in the peripheral countries during the sovereign debt crisis. In contrast, we find strong contagion effects amongst the GIIPS countries in our sample. From an event study, we find that the EAPs have been essential for the GIIPS countries in terms of reducing contagion and sovereign risk across the euro area while the Visegrad group only reacted with a moderate reduction.

2017-03, Ters, Kristyna, Ferrari, Massimo, Tissot, Bruno

How do markets evaluate monetary policy announcements and how large are the shocks they convey? These are central questions for policy makers if they are interested in evaluating their decisions and quantitatively assess the outcomes of different and possibly alternative policies. As we know, if markets were completely efficient and monetary policy was perfectly communicated by central banks, market agents should have already priced in the decision of the monetary authority at the time of the announcement. On the contrary, if the central banks are able to surprise the market, they might be able to generate real effects after their policies. We present a methodology to identify monetary policy shocks using high frequency financial data. When the precise moment of a shock is known, high frequency data allow us to pinpoint the exact moment of the event and, therefore, to correctly identify the reaction of market participants.

2013-09, Ters, Kristyna, Hoerdahl, Peter, Gyntelberg, Jacob, Urban, Jörg

The recent sovereign debt crisis in the euro area has seen credit spreads on sovereign bonds and credit default swaps (CDS) surge for a number of member states. While these events have increased interest in understanding the dynamics of sovereign spreads in bond and CDS markets, there is little agreement in the literature as to whether one of the two markets is more important than the other in terms of price discovery of sovereign credit risk. In this paper we reexamine this issue using intraday data for both market segments and employing carefully constructed cash (bond) spreads to ensure proper comparability with CDS spreads. This enables us to obtain much sharper estimates in our empirical analysis, and hence substantially clearer results with respect to price discovery. We find that the pricing of sovereign credit risk in the bond and in the CDS market converges over time, and that deviations between the two market segments do not persist for long. A key result is that the CDS market dominates the bond market in terms of price discovery in the vast majority of cases we examine. That is, CDS premia in many cases adjust more quickly to reflect new information than bonds spreads. This result holds also when taking into account transaction costs in the analysis.

2018, Ters, Kristyna, Urban, Jörg

We present a methodology for estimating a multivariate 3-regime threshold vector error correction model (TVECM) with an unknown cointegrating vector based on a new dynamic grid evaluation. This model is particularly useful for estimating deviations from parity conditions, such as unknown arbitrage costs in markets with a persistent non-zero basis between two similar financial market instruments traded in the spot and derivative markets. Our proposed 3-regime TVECM can estimate the area where arbitrageurs have no incentives to trade. It is only when the basis exceeds a critical threshold, that is when the potential gain from the basis trade exceeds the overall transaction costs, that we expect arbitrageurs to step in and carry out the respective trade. This leads to non-linear adjustment dynamics and regimes with different characteristics. Our methodology allows overall transaction costs to be quantified in markets where trading costs are opaque or unknown.

2016-07, Ters, Kristyna, Komarek, Lubos, Urban, Jörg

We examine the role of the CDS and bond markets during and before the recent euro area sovereign debt crisis as transmission channels for credit risk contagion between sovereign entities. We analyse an intraday dataset for GIIPS countries as well as Germany, France and central European countries. Our findings suggest that, prior to the crisis, the CDS and bond markets were similarly important in the transmission of sovereign risk contagion, but that the importance of the bond market waned during the crisis. We find flight-to-safety effects during the crisis in the German bond market that are not present in the pre-crisis sample. Our estimated sovereign risk contagion was greater during the crisis, with an average timeline of one to two hours in GIIPS countries. By using an exogenous macroeconomic news shock, we can show that, during the crisis period, increased credit risk was not related to economic fundamentals. Further, we find that central European countries were not affected by sovereign credit risk contagion, independent of their debt level and currency.