The yield on the 10-year Treasury has dropped from 2.02% on July 31 to below 1.60% and on Wednesday, it briefly fell below the two-year Treasury's yield for the first time since 2007. Each of the last five times the two-year and 10-year Treasury yields have inverted, a recession has followed. The average amount of time is around 22 months, according to Raymond James' Giddis. The indicator isn't perfect, though, and has given false signals in the past.