Some commentators have warned that besides expanding the nation’s debt load, the government’s virus spending — particularly the recent $1.9 trillion stimulus package — could cause the economy to overheat. Fed officials have been less worried.

“There’s a difference between essentially a one-time increase in prices and persistent inflation,” Mr. Powell said on Thursday. “The nature of a bottleneck is that it will be resolved.”

If price gains and inflation expectations moved up “materially,” he said, the Fed would react.

“We don’t think that’s the most likely outcome,” he said.

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