[A lesson of the recent financial crisis is that the interbank market is crucial for banks facing uncertainty regarding their liquidity needs. This article studies the efficiency of the interbank market in allocating funds. We show that the central bank should lower the interbank rate when confronted with a crisis that causes a disparity in the liquidity held among banks. This suggests that the traditional tenet prescribing the separation between prudential regulation and monetary policy should be abandoned. We also show that failure to cut interest rates during a crisis erodes financial stability by increasing the risk of bank runs.]

The recent financial crisis has shown that short-term collateralized borrowing may be a highly unstable source of funds in times of stress. In this paper, we develop a dynamic equilibrium model and analyze under what conditions such instability can be a consequence of market-wide changes in expectations. We derive a liquidity constraint and a collateral constraint that determine whether such expectations-driven runs are possible and show that they depend crucially on the microstructure of particular funding markets that we examine in detail. This provides insights into the differences between the tri-party repo market and the bilateral repo market, which were both at the heart of the recent financial crisis.

The recent financial crisis has shown that short-term collateralized borrowing may be a highly unstable source of funds in times of stress. In this paper, we develop a dynamic equilibrium model and analyze under what conditions such instability can be a consequence of market-wide changes in expectations. We derive a liquidity constraint and a collateral constraint that determine whether such expectations-driven runs are possible and show that they depend crucially on the microstructure of particular funding markets that we examine in detail. This provides insights into the differences between the tri-party repo market and the bilateral repo market, which were both at the heart of the recent financial crisis.

A lesson of the recent financial crisis is that the interbank market is crucial for banks facing uncertainty regarding their liquidity needs. This article studies the efficiency of the interbank market in allocating funds. We show that the central bank should lower the interbank rate when confronted with a crisis that causes a disparity in the liquidity held among banks. This suggests that the traditional tenet prescribing the separation between prudential regulation and monetary policy should be abandoned. We also show that failure to cut interest rates during a crisis erodes financial stability by increasing the risk of bank runs.