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Researchers identified the smallest financial shock causing systemic loss, revealing key triggers for financial contagion. This reverse stress testing ranks banks by systemic importance, informing capital requirements for financial stability.

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Area of Science:

  • Financial economics
  • Network science
  • Risk management

Background:

  • Financial stress testing often relies on arbitrary shock scenarios.
  • Understanding financial contagion dynamics is crucial for systemic stability.
  • Interbank market distress can propagate, leading to wider economic impact.

Purpose of the Study:

  • To develop a reverse stress test to identify minimal exogenous shocks causing systemic financial loss.
  • To rank banks based on their systemic importance derived from shock propagation analysis.
  • To analyze the impact of system instability on shock characteristics and bank-specific vulnerabilities.

Main Methods:

  • Reverse engineering of financial contagion dynamics.
  • Network analysis of 44 European banks using bank statement data.
  • Quantification of smallest exogenous shocks required to induce specific systemic losses.

Main Results:

  • Identified the smallest exogenous shock scenarios for potential financial contagion.
  • Developed a bank ranking system based on systemic importance and vulnerability to shocks.
  • Observed that increased system instability reduces the size of smallest exogenous shocks and localizes their distribution.

Conclusions:

  • Reverse stress testing offers an objective method for identifying financial contagion triggers.
  • Bank ranking based on systemic importance can inform targeted capital requirements.
  • Systemic risk is amplified in unstable financial networks, necessitating proactive risk management strategies.