Contagion and Security in Inhomogeneous Financial Networks

Speaker(s): 
Hamed Amini (University of Miami)
Date: 
Thursday, July 13, 2017 - 4:00pm
Location: 
TU Berlin, Straße des 17. Juni 136, 10623 Berlin, Raum MA 043

We derive rigorous asymptotic results for the magnitude of contagion in a large financial network and give an analytical expression for the asymptotic fraction of defaults, in terms of network characteristics. Our results extend previous studies on contagion in random graphs to inhomogeneous directed graphs with a given degree sequence and arbitrary distribution of weights. We introduce a criterion for the resilience of a large financial network to the insolvency of a small group of financial institutions and quantify how contagion amplifies small shocks to the network. We then study the problem of optimal investment in security, under network contagion risk. This is joint work with Rama Cont and Andreea Minca.