
At a meeting with Congress on Wednesday, U.S. Federal Reserve Chairwoman Janet Yellen reiterated the Fed's plan to raise interest rates in the months ahead.
But her words also showed a hint of doubt.
Yellen discussed several concerns about the economy that could make the Federal Reserve hesitate on the timing of rate hikes. She also reemphasized the Fed's willingness to experiment with controversial monetary policy tools, including negative interest rates.
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