Excess reserves and monetary policy tightening

We show that the transmission of the European Central Bank's (ECB) recent monetary policy tightening differs across banks depending on their level of excess reserves. Specifically, the net worth of reserve-rich banks may display a boost when the interest rate paid on reserves increases strongly. Focusing on the ECB's 2022 rate hiking cycle, we show that reserve-rich banks' credit supply is less sensitive to the monetary policy tightening compared to other banks. The effect varies in the cross-section of both banks and firms. The results are binding at the firm level, indicating the presence of real effects.