​​​That inversion briefly reached negative 109.50 basis points on Monday as shorter term yields fell less than longer-dated ones, creating the largest gap between shorter-dated and longer-term yields since 1981. At that time, the economy was in the early months of a recession that would last until November 1982, becoming what was then the worst economic decline since the Great Depression. "It's not unusual to get a yield curve inversion but it is unusual to get one of this magnitude.