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Contagious herding and endogenous network formation in financial networks

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  • Georg, Co-Pierre

Abstract

When banks choose similar investment strategies, the financial system becomes vulnerable to common shocks. Banks decide about their investment strategy ex-ante based on a private belief about the state of the world and a social belief formed from observing the actions of peers. When the social belief is strong and the financial network is fragmented, banks follow their peers and their investment strategies synchronize. This effect is stronger for less informative private signals. For endogenously formed interbank networks, however, less informative signals lead to higher network density and less synchronization. It is shown that the former effect dominates the latter. JEL Classification: G21, C73, D53, D85

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  • Georg, Co-Pierre, 2014. "Contagious herding and endogenous network formation in financial networks," Working Paper Series 1700, European Central Bank.
    • Handle: RePEc:ecb:ecbwps:20141700
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    2. Alt, Marius & Berger, Marius & Bersch, Johannes, 2023. "Investor responses to information updates on peer behavior and public investment policy: The case of green investments," ZEW Discussion Papers 23-024, ZEW - Leibniz Centre for European Economic Research.
    3. Jean-Cyprien H'eam & Erwan Koch, 2014. "Diversification and Endogenous Financial Networks," Papers 1408.4618, arXiv.org, revised Feb 2015.
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    5. De Caux, Robert & McGroarty, Frank & Brede, Markus, 2017. "The evolution of risk and bailout strategy in banking systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 468(C), pages 109-118.

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    More about this item

    Keywords

    endogenous nancial networks; multi-agent simulations; social learning; systemic risk;
    All these keywords.

    JEL classification:

    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • C73 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Stochastic and Dynamic Games; Evolutionary Games
    • D53 - Microeconomics - - General Equilibrium and Disequilibrium - - - Financial Markets
    • D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation

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