The Fed chair, Jerome H. Powell, and his colleagues are expected to raise interest rates half a percentage point on Wednesday, which would be the largest increase since 2000. Officials have also signaled that they will release a plan for shrinking their $9 trillion balance sheet starting in June, a policy move that will further push up borrowing costs.

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“In hindsight, there’s a really good chance that the Fed should have started tightening earlier,” said Karen Dynan, an economist at the Harvard Kennedy School and a former Treasury Department chief economist. “It was really hard to judge in real time.”