Bank Networks: Contagion, Systemic Risk and Prudential Policy
Domenico Delli Gatti () and
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Domenico Delli Gatti: Università Cattolica del Sacro Cuore
No def028, DISCE - Working Papers del Dipartimento di Economia e Finanza from Università Cattolica del Sacro Cuore, Dipartimenti e Istituti di Scienze Economiche (DISCE)
We present a network model of the interbank market in which optimizing risk averse banks lend to each other and invest in non-liquid assets. Market clearing takes place through a tâtonnement process which yields the equilibrium price, while traded quantities are determined by means of a matching algorithm. We compare three alternative matching algorithms: maximum entropy, closest matching and random matching. Contagion occurs through liquidity hoarding, interbank interlinkages and fire sale externalities. The resulting network configurations exhibits a core-periphery structure, dis-assortative behavior and low clustering coefficient. We measure systemic importance by means of network centrality and input-output metrics and the contribution of systemic risk by means of Shapley values. Within this framework we analyze the effects of prudential policies on the stability/efficiency trade-off. Liquidity requirements unequivocally decrease systemic risk but at the cost of lower efficiency (measured by aggregate investment in non-liquid assets); equity requirements tend to reduce risk (hence increase stability) without reducing significantly overall investment.
Keywords: banking networks; centrality metrics; systemic risk (search for similar items in EconPapers)
JEL-codes: C63 D85 G21 G28 L14 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-ban, nep-gth and nep-net
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Persistent link: https://EconPapers.repec.org/RePEc:ctc:serie1:def028
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