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Efficient immunization strategies to prevent financial contagion.

Teruyoshi Kobayashi¹, Kohei Hasui¹

¹Graduate School of Economics, Kobe University, 2-1 Rokkodai, Nada, Kobe 657-8501, Japan.

Scientific Reports

|January 24, 2014

Summary

We propose counteractive immunization to prevent financial network contagion. This strategy reduces systemic risk without increasing individual bank risk, unlike uniform immunization.

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Area of Science:

Financial network analysis
Systemic risk management
Contagion modeling

Background:

Traditional immunization strategies for networks face challenges with side effects.
Uniform immunization in financial networks can increase systemic risk due to de-diversification.
Previous models often overlook the potential negative consequences of immunization.

Purpose of the Study:

To investigate efficient immunization strategies for financial networks.
To address the side effects of uniform immunization, such as increased systemic risk.
To propose and evaluate a novel 'counteractive immunization' strategy.

Main Methods:

Modeling financial networks to simulate contagion.
Analyzing the effects of uniform immunization, including de-diversification.
Developing and implementing the counteractive immunization strategy.
Comparing the systemic risk reduction capabilities of both strategies.

Main Results:

Uniform immunization decreases individual bank risk but can elevate systemic risk.
Counteractive immunization effectively mitigates systemic risk.
Counteractive immunization does not alter the inherent riskiness of individual banks.

Conclusions:

Counteractive immunization offers a superior approach to managing financial network contagion.
This strategy balances risk reduction with the preservation of individual bank risk profiles.
The findings have significant implications for financial regulation and stability.