Federal Reserve Chair Janet Yellen cautioned Wednesday that global weakness and falling financial markets could depress the U.S. economy’s growth and slow the pace of Fed interest rate hikes.

But Yellen made clear that the Fed won’t likely find it necessary to cut rates after having raised them from record lows in December. She did concede that negative rates, which central banks in Japan and Europe have recently imposed, are a tool the Fed has at least studied.

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In her semiannual report to Congress, Yellen reiterated the Fed’s confidence that the U.S. economy was on track for stronger growth and an increase in too-low inflation. At the same time, she noted the weaker economic figures that have emerged since 2016 began and made clear the Fed is nervous about the risks from abroad.

Her concerns about the perils to U.S. growth contrasted with the Fed’s statement eight weeks ago, when it raised interest rates for the first time in nearly a decade and described economic risks as “balanced.”

In her testimony to the House Financial Services Committee, Yellen also:

  • Expressed sympathy with committee members who raised concerns about chronically higher-than-average unemployment among black Americans. Members of an activist group, the Fed Up coalition, attended the hearing wearing T-shirts emblazoned with the messages “What Recovery?” and “Let Our Wages Grow.” The group has been urging the Fed to delay further rate hikes until the job market improves further, especially for minority groups.
  • Sounded her concern about China’s weaker currency and economic outlook, which are rattling markets. She also warned that rising borrowing rates and a strong dollar could slow U.S. growth and hiring, a reflection of the intensified turmoil that has gripped markets. Still, she said robust hiring at the end of 2015 and signs of stronger pay growth could offset those drags.
  • Said the Fed still expects to raise rates gradually but is not on any preset course. The central bank will likely slow its pace of rate increases “if the economy were to disappoint,” she said.
  • Cautioned that the sharp declines in stock prices, rising rates for riskier borrowers and further strength in the dollar had created conditions that pose risks to growth. “These developments, if they prove persistent, could weigh on the outlook for economic activity and the labor market, although declines in longer-term interest rates and oil prices could provide some offset,” she said.
  • Observed that the central bank still thinks energy price declines and a stronger dollar will fade in coming months and help raise inflation back up to the Fed’s 2 percent target rate. The higher-valued dollar has held down U.S. inflation by making foreign goods cheaper for Americans. Worker pay, though, has begun to show its first significant gains since the Great Recession ended 6 1/2 years ago.