US government bond investors pushed two-year yields above 10-year yields by the widest margin since the early 1980s Thursday, a sign of flagging confidence in the economy’s ability to withstand additional Federal Reserve interest-rate hikes.

The yield on the shorter-dated Treasury at one point exceeded the longer-dated notes by as much as 86 basis points. The two-year rate was 4.10% on Feb. 2, before stronger-than-expected January employment data sparked a reassessment of how much higher the Fed’s policy rate might need to go to stifle inflation.