The Eurosystem's main refinancing operations (MRO) are key for the interbank money market and the monetary transmission process in the euro area. This paper investigates how money market rates respond to the information revealed by various aspects of an MRO auction outcome. Our results confirm that the level of MRO rates governed short-term money market rates before the financial crisis. Since the start of the financial crisis, however, the information content of MRO rates has changed. While the levels of MRO rates have lost much of their pre-crisis significance, the spread between the weighted average and the marginal MRO rate has become an important barometer for the actual situation in the money market during the crisis.Keywords: Monetary Policy Implementation; Central bank auctions; European Central Bank; Money markets and Financial Crisis; JEL classification: E43; E52; E58; D44
Non-technical SummaryThe relation between the Eurosystem's main refinancing (MRO) rates and the money market is key for the monetary transmission process in the euro area. The liquidity supply through MROs should ensure that short-term money market rates closely follow the MRO rates and that their volatility remains well contained. This central aim of monetary policy implementation has never been an easy task. Even before the financial crisis, a puzzling and unintended upward trend in the spread between the European overnight rate (Eonia) and the MRO rates indicated that the monetary transmission mechanism is not sufficiently understood. Since the start of the financial crisis, spreads between the ECB's main refinancing rates and the money market rates have been huge and persistent. In order to shed more light on the very beginning of the monetary transmission process in the euro area, this paper investigated how money market rates respond to new information revealed by an MRO auction outcome before and during the financial crisis.Our results show that the financial crisis changed the information content of MRO auctions in two important ways. First, we find that the information contained in the levels of the MRO rates has significantly declined since the outbreak of the crisis in