Trump plans to make the announcement later in the day at a White House ceremony, said the officials, who spoke on condition of anonymity to discuss the president's decision before the formal announcement.
After a search that was more public than any before n the Fed's more than a century of history, Trump's choice of the 64-year-old Powell will likely be seen as a safe choice who could represent continuity at the Fed.
Her term will end in February. But in the end, he opted for Powell, a Republican, over Yellen, a Democrat, explaining last week that doing so would allow him to put his own mark on the Fed.
If confirmed by the Senate, Powell would be the first Fed leader in nearly four decades to lack an advanced degree in economics. He has served on the Fed board since 2012 after a career as an investment manager through which he amassed personal wealth in the tens of millions.
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Powell will likely be welcomed on Wall Street as someone who has supported the cautious stance toward interest rate hikes that Yellen has pursued in her nearly four years as chair and may be inclined to extend that approach if the economy performs as expected.
At the same time, no one is sure how closely Powell will hew to the Yellen model. He is, for example, thought to be more skeptical than Yellen of the tighter regulations that were enacted after the 2008 financial crisis. And depending on how the economy fares, Powell might lean somewhat more aggressively toward interest rate hikes than Yellen did. How effectively he would lead the Fed's response to an unexpected economic crisis is unknown as well.
In an interview last week discussing his decision, Trump told the Fox Business Network, "You like to make your own mark, which is maybe one of the things she's got a little bit against her, but I think she is terrific."
Trump's decision against nominating Yellen for a second four-year term makes her the first Fed leader since the end of World War II not to be offered a second term after completing a first. It would also break the pattern of the past three Fed chairs, who were first nominated by the president of one party and then re-nominated by the president of the opposing party.
Though Powell would be the first Fed leader in nearly four decades to lack an advanced degree in economics, associates say he's devoted much time since joining the board to schooling himself in monetary policy from the Fed's stable of economists. He is well-liked inside the central bank and would be expected to bring a crucial ability to build consensus.
The central bank's power derives from its ability to raise and lower the federal funds rate, the benchmark that banks use to set consumer and business loans. If the Fed succeeds in managing rates, it can achieve its two policy goals maximum employment and stable inflation. If it errs, it can inadvertently trigger high inflation or an economic downturn. Under Yellen, the unemployment rate has reached a 16-year low of 4.2 per cent. But inflation has remained chronically below the Fed's 2 per cent target.
During the weekslong search, Trump often publicly discussed the process in interviews. Recently, he asked a group of Republican senators for a show of hands on the person they favored. It was far different from the approach of past administrations, which held interviews and discussions privately, with few hints of who was being considered.
The seven-member board has three other vacancies, thereby providing Trump with additional ways to put his imprint on the central bank.