awaiting Senate confirmation, is the latest economic test that he has had to contend with during his tenure.

Mr. Powell, 69, began his first four years as Fed chair in early 2018. By that Christmas, the central bank’s campaign of steady rate increases intended to fend off inflation had collided with President Donald J. Trump’s trade war to send markets plummeting.

In 2019, Mr. Trump publicly pushed for lower rates and accosted Mr. Powell — whom the president had chosen to lead the central bank — in interviews and on Twitter, calling him a “bonehead,” an “enemy” and a golfer who could not putt.

Then came the onset of the pandemic in 2020, and Mr. Powell and his colleagues crossed red lines and upended norms to rescue markets and the economy. They averted a financial crisis, but 2021 brought with it a new challenge: rapid inflation.

Now, critics are questioning whether the monetary help that Mr. Powell’s Fed unleashed to protect the pandemic-stricken economy — lowering rates to near zero and buying trillions of dollars in government bonds — combined with huge fiscal stimulus to supercharge demand and release an inflationary genie that could prove hard to trap.

The Fed has already begun removing some of that support, stopping bond purchases and communicating plans to raise interest rates by a quarter-point this month and steadily throughout the rest of the year. Mortgage rates have already begun climbing in anticipation of those actions.

wanted to see full employment return before paring back its support, has been too slow to react to changing conditions.

This moment “represents a decade of economic experience in the late 1960s and 1970s, compressed into a year,” said Lawrence H. Summers, a former Treasury secretary who spent last year warning that inflation was going to take off as the government overstimulated the economy.

“The question is: Is this the Fed’s Paul Volcker moment, or is this the Fed’s Arthur Burns moment?” he said.

Mr. Burns preceded Mr. Volcker as Fed chair and was late to react to fast inflation, afraid of slowing the job market and hurting Republicans politically. Mr. Summers warned that so far, today’s situation looked more Burns than Volcker, because the Fed spent 2021 only slowly adjusting to the reality of inflation and is now planning to only steadily adjust policy.

While White House and Fed officials had expected inflation to fade last year, optimistically labeling it “transitory,” their hopes were foiled as rapid consumer demand for couches, cars and other goods collided with pandemic-constrained supply chains. Price gains accelerated rather than slowing down.

“Transitory” has now become a dirty word in policymaking circles. Though officials continue to predict that inflation will moderate, they acknowledge more clearly how uncertain that is.

“We have never put our economy into a deep freeze and then defrosted it before,” said Megan Greene, a senior fellow at a Harvard Kennedy School center and chief global economist for the Kroll Institute. “And we haven’t had a war in continental Europe for a while.”

in Shanghai and Shenzhen, China, a major technology manufacturing hub and port city, are boosting the risk that supply chains remain roiled in the coming months. Those shocks from outside come when price pressures have already begun broadening to categories like rent, another development that could make inflation last.

It is not clear whether those factors will keep inflation drastically higher, but Fed officials will be watching warily.

If the Fed has to raise interest rates to painful levels to cool off the economy and put a lid on prices, it could send financial markets tumbling, erasing stock and housing wealth. It could also slow wage increases and throw people out of jobs as companies retrench, curtailing investment and hiring.

But Fed inaction — or under-action — would also carry risks. High prices that chip away at consumer buying power year after year would make it hard for families and businesses to plan for the future. They could especially hurt people who are out of work and living on savings, or the poor, who devote a big chunk of their budgets to necessities and have less room to cut back if costs get out of control.

Mr. Volcker, Mr. Powell’s long-ago predecessor, one of his professional idols and — potentially, if things go wrong — his muse, died in 2019. But he had thoughts on the trade-off.

Maintaining confidence that a dollar will be able to buy tomorrow what it can today “is a fundamental responsibility of monetary policy,” Mr. Volcker wrote in his 2018 memoir. “Once lost, the consequences can be severe and stability hard to restore.”

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