Policy impact studies often suffer from endogeneity problems. Consider the case of the ECB Securities Markets Programme: if Eurosystem interventions were triggered by sudden and strong price deteriorations, looking at daily price changes may bias downwards the correlation between yields and the...

This paper examines the degree of fragmentation in the Euro overnight unsecured money market during the period June 2008 - August 2013 using interbank loans constructed from payments data. After controlling for cross-country differences in bank risk, we document several episodes of significant...