The combination of various monetary support measures helped to stabilise markets and ensure the smooth transmission of monetary policy, but the decisive role of the PEPP was acknowledged by market participants. In particular, the spread of the euro area GDP-weighted yield over the equivalent overnight indexed swap (OIS) rate fell sharply after the announcement of the launch of the PEPP (see Chart 1), to levels below those observed before the pandemic. This is the ECB's preferred market indicator for measuring fragmentation risk (see Hutchinson and Mee (2020) and Lane (2022)).
The flexibility of the PEPP - in terms of asset classes, jurisdictions as well as the timing of purchases - was a strong signal to the markets. Analysts stress the success of this flexibility, which brought down credit risk premia after the peak of market stress in March 2020.
However, this flexibility did not result in major deviations from the ECB's capital key at the end of the programme. While these deviations peaked in the first few weeks following the launch of the PEPP (May 2020), they subsequently narrowed during the implementation of the programme.
The compression of the term premium was also highlighted (see Schnabel, 2021). According to Altavilla et al. (2021), the PEPP (estimated with an envelope of EUR 1,350 billion at the time), coupled with the additional APP envelope of EUR 120 billion, reduced the 10-year sovereign bond term premium by an additional 45 bps compared to the impact of the pre-Covid APP alone.
The discontinuation of net purchases under the PEPP does not mean the end of the Eurosystem's interventions
Since the beginning of the programme, redemptions from maturing securities have been fully reinvested by the Eurosystem, which confirmed on 10 March that these reinvestments would continue until at least the end of 2024. The PEPP portfolio will thus remain stable until then. The Governing Council of the ECB also decided on 15 June 2022 to "apply flexibility in reinvesting redemptions coming due in the PEPP portfolio". Net purchases under the PEPP could also resume, if necessary, in response to negative shocks associated with the pandemic (monetary policy decision of 09 June 2022).
The stock of securities held by the Eurosystem will only decrease gradually. According to respondents to the June 2022 Survey of Monetary Analysts, the stock of bonds should stand at (i) EUR 1,718 billion in Q4 2024 (median of responses) under the PEPP (see Chart 3), while (ii) bonds held under the APP is only expected to decrease gradually as of the end of 2023, with a volume of around EUR 3,438 billion expected in Q4 2024. The stock effect is thus likely to contribute to maintaining favourable financing conditions: various empirical studies highlight the effect on the decline in yields linked to the volumes held (see Arrata, Nguyen (2017), Dalbard, Le Bihan and Vives (2018) and Hubert (Working Paper Banque de France, forthcoming).