For the following analysis, the monetary policy impacts are estimated using the base money growth rate and EONIA rate, whereas the relative bid-ask spread is employed for measuring liquidity levels. The research method includes literature-based research about common market liquidity theories, a short timeline of important ECB monetary policy decisions, descriptive statistics on liquidity levels and monetary policy variables and a VAR analysis, including variables spreads, returns, volatilities, industrial production and inflation.

The results indicate that a decrease (increase) in stock market liquidity or an increase (decrease) in bondmarket volatility lead to a decrease (increase) of EONIA. Furthermore, decreases (increases) in stock return or industrial production result in a decrease (increase) of EONIA. However, base money growth is positively correlated only to changes in bond market volatility. Overall, the results suggest that the monetary policy decisions by the ECB are influenced by changing market conditions without the ability to forecast liquidity levels.]]>