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Discussion PaperSeries 2: Banking and Financial Studies No 06/2009
Discussion Papers represent the authors’ personal opinions and do not necessarily reflect the views of the Deutsche Bundesbank or its staff.
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Non-Technical Summary
The information content of banks’ security prices assumes an increasingly larger role in supervisory monitoring. The interest in this issue is twofold. Investors that share the business risk of banks have an incentive to discipline the business activities of a banks’ management.
They can exercise direct market discipline through an adjustment of refinancing conditions. If market prices reflect banks’ riskiness supervisors can use this information to exert indirect market discipline.
The general consensus in the academic literature is that security prices adequately reflect risks of the underlying bank. However, an important concern is that banks’ security prices may be distorted when a bank becomes large enough to threaten overall financial stability and a public bail-out becomes likely.
These banks are called “too-big-to-fail” banks (TBTF). Consequently, investors are less concerned about the failure of a TBTF bank given that losses are limited which reduces their incentive to exercise market discipline.
This paper examines the information content of CDS spreads for a sample of 91 banks from 24 countries. CDSs have gained increasing prominence in the derivative market and have become a core instrument for the transfer of risk. Additionally, several papers show that CDS markets reflect new market information more rapidly than bond markets and that they are also leading indicators such as ratings.
For these reasons, CDS spreads have become an important tool for supervisory risk assessment.
Overall, we find that CDS spreads reflect banks’ risk. However, we further detect an important size effect that vindicates the existence of a distortion due to too big- to-fail. A one percentage increase in the mean size of a bank relative to the home country’s GDP reduces the CDS spread by about two basis-points.
While this appears small, one has to keep in mind that mergers can involve substantially larger increases in size.
In addition, our results confirm that some banks may already have reached a size that makes them too-big-to-rescue. In other words, we find that the distortion of CDS spreads declines for banks beyond a threshold size of about 10 percent market capitalization relative to the home country’s GDP.
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And:"Abstract
This paper examines the potential distortion of prices in the CDS market
caused by too-big-to-fail. Overall, we find evidence for market discipline in
the CDS market. However, CDS prices are distorted due to a size effect which
arises when investors expect a public bail-out( NB DON ) as a result of too-big-to-fail. A
one percentage point increase in size reduces the CDS spread of a bank by
about two basis points. We further find that some banks have already reached
a size that makes them too-big-to-be-rescued. While the price distortion for
these banks decreases the existence of banks that are considered to be toobig-
to-rescue raises important new issues for banking supervisors.
5 Conclusion
This paper analyzes pricing effects due to banks’ size for the CDS market. We
hypothesized that CDS spreads decline in banks’ size, because of an increase in
the probability of a bail-out due to too-big-to-fail. We find that an increase in the
mean size of 1 percentage point reduces the CDS spread by about 2 basis points.
While this appears comparably small mergers of large banks can induce substantially
larger changes in banks’ size and subsequently in their CDS spreads. This raises two
potential concerns. First, the reduction in CDS spreads may limit any potential
21
influence of market discipline on bank management via refinancing costs providing
a competitive advantage. Second, banks might pursue a socially suboptimal size to
exploit better refinancing conditions. Third, supervisors may receive wrong market
signals, when they monitor distorted market prices.
A further aspect raised by our analysis is the existence of banks that have already
achieved a size that makes them too-big-to-be rescued. The existence of such
banks leaves us with an ambiguous feeling. While a stronger market discipline for
such banks is reassuring from a supervisory perspective it also demonstrates the
limits of public bail-outs. As a consequence, the private sector will have to be bailed
in bearing a larger part of the costs. Additionally, given that large banks typically
pursue a substantial part of their business activities across borders may make the
coordination of national supervisors necessary. An important step towards this direction
represents the Memorandum of Understanding (MoU) on the cooperation
between the financial supervisory authorities, Central banks and finance ministries
of the European Union on cross border financial stability in June 2008. It aims to
facilitate the management and resolution of cross-border systemic financial crises in
order to minimize the economic and social costs, while promoting market discipline
and limiting moral hazard."
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