Interest rate dispersion and volatility in the market for daily funds

The purpose of this paper is to study the determinants of equilibrium in the market for daily funds. We use the EONIA panel database which includes daily information on the lending rates applied by contributing commercial banks. The data clearly show an increase in both the time series volatility and the cross-section dispersion of rates towards the end of the reserve maintenance period. These increases are highly correlated. We design a model to account for these empirical facts. Our theoretical model shows how the operational framework of monetary policy causes a reduction in the elasticity of the supply of funds by banks throughout the reserve maintenance period. This reduction in the elasticity together with market segmentation and heterogeneity is able to generate distributions for the interest rates and quantities traded with the same properties as in the data. We also investigate the effects of the changes in the Eurosystem's operational framework, enacted on March 2004, for interest rate behaviour.