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The European Central Bank is set to announce the end date to its bond-buying stimulus on Thursday, as concerns over the accelerating pace of inflation in the eurozone grip policymakers.
The stop is a prelude to the ECB hiking rates for the first time in over a decade in the weeks that follow, turning the page on an era of ultra-loose monetary policy.
Inflation in the eurozone rose to 8.1 percent in May, the highest level in the history of the currency club and well above the ECB's own two-percent target.
The surge has largely been driven by the war in Ukraine, which has decisively pushed up the cost of energy, food and raw materials.
Persistent price pressures have forced the ECB into an "enormous U-turn" since December, said Carsten Brzeski, head of macro at ING bank.
From saying inflation would be "temporary" and warding off interest rate hikes in 2022, the ECB is now racing to catch up with other major central banks in the United States and Britain.
With inflation picking up, "the only really interesting question is why they don't start hiking rates immediately instead of waiting until July", Brzeski said.
- 'Lift off' -
Under pressure to show the ECB was responding to inflation, President Christine Lagarde set out the likely next steps for the central bank in a blog post in late May.
The unusually clear statement foresaw an end to the ECB's crisis-era stimulus programme "very early in the third quarter".
The so-called asset purchase programme, or APP, is the last in a series of debt-purchasing measures worth a total of around five trillion euros ($5.4 trillion) deployed by the ECB since 2014.
Lagarde then went on to reveal ECB policy through the second half of the year, predicting a "lift off" in rates at the governing council's next meeting in July, with the central bank bringing an end to negative interest rates by the end of September.
Of the ECB's three main interest rates, the so-called deposit rate -- which is normally the interest commercial banks would receive for parking their cash with the ECB overnight -- has been negative since 2014.
- 'Benchmark pace' -
Still up for discussion in Amsterdam, where the governing council is meeting instead of at its usual venue in Frankfurt, is the size of the first step.
Some members have called on the ECB to follow the US Federal Reserve and bring the curtain down on negative interest rates with a single half-point hike.
The head of the Dutch central bank, Klaas Knot, said in May that such a move was "clearly not off the table".
But the ECB's chief economist, Philip Lane, pushed back against suggestions of a big hike, calling 25 basis points -- or a quarter of a percentage point -- the "benchmark pace".
ECB followers will be listening carefully to Lagarde's press conference at 2:30 pm (1230 GMT) for some indication of the prevailing thinking among policymakers.
Lagarde could "give a nod to the hardliners" by leaving the door open to a steeper rise, said Franck Dixmier, head of fixed income at Allianz Global Investors.
The decision will depend to a large extent on how the outlook for the economy changes.
The ECB is scheduled to publish new economic forecasts alongside its policy decisions on Thursday.
Its previous estimates -- published in the immediate aftermath of Russia's invasion of Ukraine -- cut projected growth in the eurozone in 2022 to 3.7 percent and saw inflation rising to 5.1 percent.
Looking ahead, the ECB will be keeping a particularly close eye on any serious divergence in borrowing costs across the eurozone, as measured by the difference between yields on individual countries' bonds and those of Germany -- seen as a benchmark of stability.
Currently, the spread between Italian and German 10-year bonds is at its widest since the early stages of the coronavirus pandemic.
Lagarde has previously vowed to act "promptly" if needed, raising the possibility of designing a new instrument "in short order".
S.Weaver--TFWP