A minimal model of money creation within secured interbank markets

Victor Le Coz, Michael Benzaquen and Damien Challet

Journal of Economic Behavior & Organization, 2025, vol. 237, issue C

Abstract: We propose a minimal model of the secured interbank network able to shed light on recent money markets puzzles. We find that excess liquidity emerges due to the interactions between the reserves and liquidity ratio constraints; the appearance of evergreen repurchase agreements and collateral re-use emerges as a simple answer to banks’ counterparty risk and liquidity ratio regulation. In line with prevailing theories, re-use increases with collateral scarcity. In our agent-based model, banks create money endogenously to meet the funding requests of economic agents. The latter generate payment shocks to the banking system by reallocating their deposits. Banks absorbs these shocks thanks to repurchase agreements, while respecting reserves, liquidity, and leverage constraints. The resulting network is denser and more robust to stress scenarios than an unsecured one; in addition, the stable bank trading relationships network exhibits a core–periphery structure. Finally, we show how this model can be used as a tool for stress testing and monetary policy design.

Keywords: Monetary economics; Agent Based Model; Asset Purchase Program; Liquidity stress test; Interbank network; Repo markets (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:jeborg:v:237:y:2025:i:c:s0167268125002616

DOI: 10.1016/j.jebo.2025.107142

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