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Liquidity Flows in Interbank Networks

Fabio Castiglionesi () and Mario Eboli

Review of Finance, 2018, vol. 22, issue 4, 1291-1334

Abstract: This article characterizes the interbank deposit network as a flow network that is able to channel liquidity flows among banks. These flows are beneficial, allowing banks to cope with liquidity risk. First, we analyze the efficiency of three network structures: star-shaped, complete, and incomplete in transferring liquidity among banks. The star-shaped interbank network achieves the complete coverage of liquidity risk with the smallest amount of interbank deposits held by each bank. This result implies that the star-shaped network is most resilient to systemic risk. Second, we analyze the banks’ decentralized interbank deposit decisions for a given network structure. We show that all network structures can generate an inefficiently low amount of interbank deposits. However, the star-shaped network induces banks to hold an amount of interbank deposits that is the closest to the efficient level. These results provide a rationale for consistent empirical evidence on sparse and centralized interbank networks.

Keywords: Interbank network; Liquidity coinsurance; Flow networks (search for similar items in EconPapers)
JEL-codes: D85 G21 (search for similar items in EconPapers)
Date: 2018
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