The interbank money market plays a key role in the execution of monetary policy. Hence, it is important to know the functioning of this market and the determinants of the interbank money market rate. In this paper, we develop an interbank money market model with a heterogeneous banking sector....

This paper presents an interbank market model with a heterogeneous banking sector. We show that banks participate in the interbank market because they differ in marginal costs of obtaining funds from the European Central Bank. Our model shows that this heterogeneity implies intermediation by...