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We investigate the effect of Eurosystem asset purchase programmes (APP) on the monthly yields of 10-year sovereign bonds for 11 euro area sovereigns during January-December 2020. The analysis is based on time-varying coefficient methods applied to monthly panel data covering the period 2004m09-2020m12. During 2020, APP contributed to an average decline in yields estimated in the range of 58-76 bps. In December 2020, the effect per EUR trillion ranged between 34 bps in Germany and 159 bps in Greece. Stronger effects generally display diminishing returns. Our findings suggest that a sharp decline in the size of the APP in the aftermath of the COVID-19 crisis could lead to very sharp increases in bond yields, particularly in peripheral countries. The analysis additionally reveals a differential response to global risks between core and peripheral countries, with the former enjoying safe-haven benefits. Markets' perceptions of risk are found to be significantly affected by credit ratings, which is in line with recent evidence based on constant parameter methods.

The effect of Eurosystem asset purchase programmes on euro area sovereign bond yields during the COVID-19 pandemic