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The purpose of this paper is to analyze the impact of financial penalties on the stability of the banking sector.

A unique database of 671 financial penalties imposed on 68 international listed banks between 2007 and 2014 and a fixed-effects panel data approach were used.

The results show that financial penalties increase banks’ systemic risk exposure but do not significantly affect banks’ contribution to systemic risk. Additionally, the link between financial penalties and systemic risk exposure is weaker in regulatory and supervisory systems with more prompt corrective power among national authorities. By contrast, supervisory authorities’ stronger power to declare insolvency and a greater external monitoring culture exacerbate the positive effects of financial penalties on systemic risk exposure.

The punishment of misconduct should correct the social harm and prevent future misconduct while ensuring the banking system’s stability. Therefore, authorities should punish misconduct by implementing penalties against the financial institutions at a specific amount that offsets the damages of misconduct but does not threaten systemic stability. Penalties against institutions may be complemented by financial penalties against upper management to induce a more responsible culture in banks.

This paper is the first to study the effect of financial penalties on the stability of the financial system. The results contribute to the ongoing debate on the appropriateness of financial penalties and address the question of whether bank regulators reduce or contribute to banks’ systemic risk.

Academic research has intensively analyzed the relationship between market concentration or market power and banking stability but provides ambiguous results, which are summarized under the concentration-stability/fragility view. We provide empirical evidence that the mixed results are due to the difficulty of identifying reliable variables to measure concentration and market power.

Using data from 3,943 banks operating in the European Union (EU)-15 between 2013 and 2020, we employ linear regression models on panel data. Banking market concentration is measured by the Herfindahl–Hirschman Index (HHI), and market power is estimated by the product-specific Lerner Indices for the loan and deposit market, respectively.

Our analysis reveals a significantly stability-decreasing impact of market concentration (HHI) and a significantly stability-increasing effect of market power (Lerner Indices). In addition, we provide evidence for a weak (or even absent) empirical relationship between the (non)structural measures, challenging the validity of the structure-conduct-performance (SCP) paradigm. Our baseline findings remain robust, especially when controlling for a likely reverse causality.

Our results suggest that the HHI may reflect other factors beyond market power that influence banking stability. Thus, banking supervisors and competition authorities should investigate market concentration and market power simultaneously while considering their joint impact on banking stability.