“…The current level of excess reserves by the banking sector is primarily driven by the quantitative easing (QE) programs of central banks. For example, since 2015, the euro area banking sector increased reserve holdings by more than EUR 1.3 trillion(Bechtel et al, 2021).4 As a technical condition to ensure the uniqueness of the equilibrium, we assume that L(•) is not too concave, i.e., |L (r L )| is bounded above.…”