The impact of the excess reserves of the banking sector on interest rates and money supply in Poland

Authors

Mariusz Kapuściński
Institute for Social and Economic Studies
Ilona Pietryka
Nicolaus Copernicus University in Toruń
http://orcid.org/0000-0002-2979-6538

Keywords:

excess reserves, interest rate pass through, money multiplier, GARCH, VAR, panel data models

Synopsis

In this monograph we aim to analyse the effects of leaving excess reserves in the banking sector by the central bank on the level and the variability of interest rates, as well as on money supply. To this end, we use mainly data for Poland, but in some cases, for robustness, also for a panel of Poland, the euro area, the Czech Republic and Hungary, as there had only been a limited variability in some policy variables in our sample for Poland. We estimate the parameters of GARCH, (P)VAR (vector autoregressive or panel vector autoregressive) and (panel) linear regression models.
We find that excess reserves affect the level and the variability of an overnight money market interest rate. However, the variability of the overnight money market interest rate, shaped to a large extent by excess reserves, does not affect the level of longer-term interest rates, and we find little evidence of its impact on their variability. Neither do excess reserves translate into higher money supply.
Our results imply that the current monetary policy operational framework in Poland is adequate to ensure the transmission of the central bank policy rate to money market interest rates. Furthermore, it appears unlikely that raising the amount of excess reserves left, as proposed by some policymakers, would affect money supply. Instead, it would lower the money multiplier and the overnight money market interest rate, as well as increase its volatility.

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October 17, 2021

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