Wall Street economists are telling investors to brace for the biggest tightening of monetary policy in more than a decade.

With the world economy heading into its strongest period since 2011, Citigroup Inc. and JPMorgan Chase & Co. predict average interest rates across advanced economies will climb to at least 1 percent next year in what would be the largest increase since 2006.

As for the quantitative easing that marks its 10th anniversary in the U.S. next year, Bloomberg Economics predicts net asset purchases by the main central banks will fall to a monthly $18 billion at the end of 2018, from $126 billion in September, and turn negative during the first half of 2019.

That reflects an increasingly synchronized global expansion finally strong enough to spur inflation, albeit modestly. The test for policy makers, including incoming Federal Reserve Chair Jerome Powell, will be whether they can continue pulling back without derailing demand or rocking asset markets.

“2018 is the year when we have true tightening,” said Ebrahim Rahbari, director of global economics at Citigroup in New York. “We will continue on the current path where financial markets can deal quite well with monetary policy but perhaps later in the year, or in 2019, monetary policy will become one of the complicating factors.”

A clearer picture should form this week when the Norges Bank, Fed, Bank of England, European Central Bank and Swiss National Bank announce their final policy decisions of 2017. They collectively set borrowing costs for more than a third of the world economy. At least 10 other central banks also deliver decisions this week.

The Fed will dominate the headlines on Wednesday amid predictions it will raise its benchmark by a quarter of a percentage point. Outgoing chair Janet Yellen is set to signal more increases to come in 2018. On Thursday, the SNB, BOE and ECB will make decisions in quick succession although each is forecast to keep rates on hold.

There will likely be more activity next year as Citigroup estimates the advanced world’s average rate will reach its highest since 2008, climbing 0.4 percentage point to 1 percent. JPMorgan projects its gauge to rise to 1.2 percent, a jump of more than half a percentage point from 0.68 percent at the end of this year.

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