U.S. Treasury bond yields plunged to a fresh record low Friday while bets on future cuts from the Federal Reserve intensified, raising the prospect of negative interest in the world’s biggest economy.

Benchmark 10-year Treasury note yields tumbled to an all-time low of 0.699% in early Friday trading, just three days after breaching 1% for the first time ever following the Federal Reserve’s emergency 50 basis point interest rate cut earlier this week.