While the target federal funds rate represents a policy instrument, the effective federal funds rate is determined in a competitive interbank market. The paper proposes a theory of its determination. This yields a specific term structure of interest rates, an account of why the money multiplier...

Major central banks remunerate reserves at negative interest rates and it is increasingly likely that they will keep rates negative for many more years. To study the long run implications of negative rates, we construct a dynamic general equilibrium model with commercial banks funding investment...