To "ensure depth and liquidity," the European Central Bank intervened in sovereign debt markets through its Securities Markets Programme (SMP), providing a unique opportunity to estimate the effects of large-scale asset purchases on sovereign bond liquidity premia. From reduced-form estimates,...

In 2010, in response to an ever-worsening fiscal crisis, the ECB began purchasing sovereign debt from troubled euro-area countries through its Securities Market Programme (SMP). This program was designed to improve market functioning and restore the monetary transmission mechanism within the...