Yield curve inversion hit the three-month mark, an occurrence that has preceded the past seven U.S. recessions.

The yield curve remained inverted for three months, or an entire quarter, which has for half a century been a clear signal that the economy is heading for recession in the next nine to 18 months, according to Campbell Harvey, a Duke University finance professor who spoke to NPR on Sunday. His research in the mid-1980s first linked yield curve inversions to recessions.

“That has been associated with predicting a recession for the last seven recessions,” Harvey said. “From the 1960s, this indicator has been reliable in terms of foretelling a recession, and also importantly, it has not given any false signals yet.”

More: www.npr.org/2019/06/30/737476633/what-just-happened-also-occurred-before-the-last-7-u-s-recessions-reason-to-worr