25 Years IWH

Regulation of International Financial Markets and International Banking

This research group belongs to the IWH Research Cluster Financial Stability and Regulation. The research group analyses causes and consequences of banks' international activities and the regulatory framework they operate in.

Internationally active banks can facilitate an efficient international allocation of capital and provide channels for international risk sharing. But they can also be a source of financial instabilities themselves, thus contributing to international contagion and risk-shifting. This is one reason for the current re-regulation of international banking.

The research group contributes to the literature in three ways. First, the group empirically analyses the channels through which shocks are transmitted by internationally active banks. Second, the group analyses the build-up of aggregate imbalances in integrated banking markets and resulting consequences for the real economy. Third, the group analyses the impact of changes in banking supervision and regulation on (inter)national activities of banks, with a special focus on the European integration process.

 

IWH Data Project: International Banking Library

Research Cluster
Financial Stability and Regulation

Your contact

Professor Lena Tonzer, PhD
Professor Lena Tonzer, PhD
Mitglied - Department Financial Markets
Send Message +49 345 7753-835 Personal page

Refereed Publications

Too connected to fail? Inferring network ties from price co-movements

Jakob Bosma Michael Koetter Michael Wedow

in: Journal of Business & Economic Statistics , forthcoming

Abstract

We use extreme value theory methods to infer conventionally unobservable connections between financial institutions from joint extreme movements in credit default swap spreads and equity returns. Estimated pairwise co-crash probabilities identify significant connections among up to 186 financial institutions prior to the crisis of 2007/2008. Financial institutions that were very central prior to the crisis were more likely to be bailed out during the crisis or receive the status of systemically important institutions. This result remains intact also after controlling for indicators of too-big-to-fail concerns, systemic, systematic, and idiosyncratic risks. Both CDS-based and Equity-based connections are significant predictors of bailouts.

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Spillover Effects among Financial Institutions: A State-Dependent Sensitivity Value-at-Risk Approach

Z. Adams R. Füss Reint E. Gropp

in: Journal of Financial and Quantitative Analysis , No. 3, 2014

Abstract

In this paper, we develop a state-dependent sensitivity value-at-risk (SDSVaR) approach that enables us to quantify the direction, size, and duration of risk spillovers among financial institutions as a function of the state of financial markets (tranquil, normal, and volatile). For four sets of major financial institutions (commercial banks, investment banks, hedge funds, and insurance companies) we show that while small during normal times, equivalent shocks lead to considerable spillover effects in volatile market periods. Commercial banks and, especially, hedge funds appear to play a major role in the transmission of shocks to other financial institutions.

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Do Banks Benefit from Internationalization? Revisiting the Market Power–Risk Nexus

Claudia M. Buch C. T. Koch Michael Koetter

in: Review of Finance , No. 4, 2013

Abstract

We analyze the impact of bank internationalization on domestic market power (Lerner index) and risk for German banks. Risk is measured by the official declaration of regulatory authorities that a bank is distressed. We distinguish the volume of foreign assets, the number of foreign countries, and different modes of foreign entry. Our analysis has three main results. First, higher market power is associated with lower risk. Second, holding assets in many countries reduce market power at home, but banks with a higher share of foreign assets exhibit higher market power. Third, bank internationalization is only weakly related to bank risk.

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Should I Stay or Should I Go? Bank Productivity and Internationalization Decisions

Claudia M. Buch C. T. Koch Michael Koetter

in: Journal of Banking & Finance , No. 42, 2014

Abstract

Differences in firm-level productivity explain international activities of non-financial firms quite well. We test whether differences in bank productivity determine international activities of banks. Based on a dataset that allows tracking banks across countries and across different modes of foreign entry, we model the ordered probability of maintaining a commercial presence abroad and the volume of banks’ international assets empirically. Our research has three main findings. First, more productive banks are more likely to enter foreign markets in increasingly complex modes. Second, more productive banks also hold larger volumes of foreign assets. Third, higher risk aversion renders entry less likely, but it increases the volume of foreign activities conditional upon entry.

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Taxing Banks: An Evaluation of the German Bank Levy

Claudia M. Buch Björn Hilberg Lena Tonzer

in: Journal of Banking & Finance , 2016

Abstract

Bank distress can have severe negative consequences for the stability of the financial system. Regimes for the restructuring and resolution of banks, financed by bank levies, aim at reducing these costs. This paper evaluates the German bank levy, which has been implemented since 2011. Our analysis offers three main insights. First, revenues raised through the levy were lower than expected. Second, the bulk of the payments were contributed by large commercial banks and by the central institutions of savings banks and credit unions. Third, for those banks, which were affected by the levy, we find evidence for a reduction in lending and higher deposit rates.

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Working Papers

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European versus Anglo-Saxon Credit View: Evidence from the Eurozone Sovereign Debt Crisis

Marc Altdörfer Carlos A. De las Salas Vega Andre Guettler Gunter Löffler

in: IWH Discussion Papers , No. 34, 2016

Abstract

We analyse whether different levels of country ties to Europe among the rating agencies Moody’s, S&P, and Fitch affect the assignment of sovereign credit ratings, using the Eurozone sovereign debt crisis of 2009-2012 as a natural laboratory. We find that Fitch, the rating agency among the “Big Three” with significantly stronger ties to Europe compared to its two more US-tied peers, assigned on average more favourable ratings to Eurozone issuers during the crisis. However, Fitch’s better ratings for Eurozone issuers seem to be neglected by investors as they rather follow the rating actions of Moody’s and S&P. Our results thus doubt the often proposed need for an independent European credit rating agency.

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Friend or Foe? Crowdfunding Versus Credit when Banks are Stressed

Daniel Blaseg Michael Koetter

in: IWH Discussion Papers , No. 8, 2015

Abstract

Does bank instability push borrowers to use crowdfunding as a source of external finance? We identify stressed banks and link them to a unique, manually constructed sample of 157 new ventures seeking equity crowdfunding. The sample comprises projects from all German equity crowdfunding platforms since 2011, which we compare with 200 ventures that do not use crowdfunding. Crowdfunding is significantly more likely for new ventures that interact with stressed banks. Innovative funding is thus particularly relevant when conventional financiers are facing crises. But crowdfunded ventures are generally also more opaque and risky than new ventures that do not use crowdfunding.

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Do Banks Benefit from Internationalization? Revisiting the Market Power-Risk Nexus

Claudia M. Buch C. T. Koch Michael Koetter

in: Bundesbank Discussion Paper 09/2010 , 2010

Abstract

Recent developments on international financial markets have called the benefits of bank globalization into question. Large, internationally active banks have acquired substantial market power, and international activities have not necessarily made banks less risky. Yet, surprisingly little is known about the actual link between bank internationalization, bank risk, and market power. Analyzing this link is the purpose of this paper. We jointly estimate the determinants of risk and market power of banks, and we analyze the effects of changes in terms of the number of foreign countries (the extensive margin) and the volume of foreign assets (the intensive margin). Our paper has four main findings. First, there is a strong negative feedback effect between risk and market power. Second, banks with higher shares of foreign assets, in particular those held through foreign branches, have higher market power at home. Third, holding assets in a large number of foreign countries tends to increase bank risk. Fourth, the impact of internationalization differs across banks from different banking groups and of different size.

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Drivers of systemic risk: Do national and European perspectives differ?

Claudia M. Buch Thomas Krause Lena Tonzer

in: Deutsche Bundesbank Discussion Papers , No. 9, 2017

Abstract

In Europe, the financial stability mandate generally rests at the national level. But there is an important exception. Since the establishment of the Banking Union in 2014, the European Central Bank (ECB) can impose stricter regulations than the national regulator. The precondition is that the ECB identifies systemic risks which are not adequately addressed by the macroprudential regulator at the national level. In this paper, we ask whether the drivers of systemic risk differ when applying a national versus a European perspective. We use market data for 80 listed euro-area banks to measure each bank’s contribution to systemic risk (SRISK) at the national and the euro-area level. Our research delivers three main findings. First, on average, systemic risk increased during the financial crisis. The difference between systemic risk at the national and the euro-area level is not very large, but there is considerable heterogeneity across countries and banks. Second, an exploration of the drivers of systemic risk shows that a bank’s contribution to systemic risk is positively related to its size and profitability. It decreases in a bank’s share of loans to total assets. Third, the qualitative determinants of systemic risk are similar at the national and euro-area level, whereas the quantitative importance of some determinants differs.

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Taxing Banks: An Evaluation of the German Bank Levy

Claudia M. Buch Björn Hilberg Lena Tonzer

in: Deutsche Bundesbank Discussion Paper No. 38/2014 , No. 38, 2014

Abstract

Bank distress can have severe negative consequences for the stability of the financial system, the real economy, and public finances. Regimes for restructuring and restoring banks financed by bank levies and fiscal backstops seek to reduce these costs. Bank levies attempt to internalize systemic risk and increase the costs of leverage. This paper evaluates the effects of the German bank levy implemented in 2011 as part of the German bank restructuring law. Our analysis offers three main insights. First, revenues raised through the bank levy are minimal, because of low tax rates and high thresholds for tax exemptions. Second, the bulk of the payments were contributed by large commercial banks and the head institutes of savings banks and credit unions. Third, the levy had no effect on the volume of loans or interest rates for the average German bank. For the banks affected most by the levy, we find evidence of fewer loans, higher lending rates, and lower deposit rates.

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