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Portfolio Diversification and Systemic Risk in Interbank Networks


Tasca, Paolo; Deghi, Andrea; Battiston, Stefano (2017). Portfolio Diversification and Systemic Risk in Interbank Networks. Journal of Economic Dynamics and Control, 82:96-124.

Abstract

The recent credit crisis of 2007/08 has raised a debate about the so-called knife-edge properties of financial markets. The paper contributes to the debate shedding light on the controversial relation between risk-diversification and financial stability. We model a financial network where assets held by borrowers to meet their obligations, include claims against other borrowers and securities exogenous to the network. The balance-sheet approach is conjugated with a stochastic setting and by a mean-field approximation the law of motion of the system's fragility is derived. We show that diversification has an ambiguous effect and beyond a certain levels elicits financial instability. Moreover, we find that risk-sharing restrictions create a socially preferable outcome. Our findings have significant implications for future policy recommendation.

Abstract

The recent credit crisis of 2007/08 has raised a debate about the so-called knife-edge properties of financial markets. The paper contributes to the debate shedding light on the controversial relation between risk-diversification and financial stability. We model a financial network where assets held by borrowers to meet their obligations, include claims against other borrowers and securities exogenous to the network. The balance-sheet approach is conjugated with a stochastic setting and by a mean-field approximation the law of motion of the system's fragility is derived. We show that diversification has an ambiguous effect and beyond a certain levels elicits financial instability. Moreover, we find that risk-sharing restrictions create a socially preferable outcome. Our findings have significant implications for future policy recommendation.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:03 Faculty of Economics > Department of Banking and Finance
Dewey Decimal Classification:330 Economics
Language:English
Date:September 2017
Deposited On:22 Nov 2017 14:11
Last Modified:19 Feb 2018 09:21
Publisher:Elsevier
ISSN:0165-1889
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.jedc.2017.01.013
Related URLs:http://www.sciencedirect.com/science/article/pii/S0165188917300210 (Publisher)
Other Identification Number:merlin-id:14736

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