KEY POINTS
  • Fitch announced late on Tuesday that it had cut the U.S. long-term foreign currency issuer default rating to AA+ from AAA.
  • U.S. stock futures were sharply lower after the downgrade, while markets in Europe and Asia also sank.
Traders work on the floor of the New York Stock Exchange, June 29, 2023.

Global stock markets tumbled on Wednesday after ratings agency Fitch downgraded the United States' long-term credit rating — but top economists say there is nothing to worry about.

Fitch announced late on Tuesday that it had cut the U.S. long-term foreign currency issuer default rating to AA+ from AAA, citing "expected fiscal deterioration over the next three years," an erosion of governance in light of "repeated debt-limit political standoffs" and a generally growing debt burden.