Yield Curve Inversion
A yield curve inversion is when short-dated Treasury yields sit above long-dated ones, most often measured as the 2s10s spread turning negative. That is backwards. Investors normally want extra yield for lending longer, so an inverted curve says the market expects short rates to fall a long way, which historically has meant a Fed cutting into a weakening economy.
An inverted 2s10s or 3-month/10-year curve has come before every US recession of the past half century, usually 6 to 24 months ahead. When the curve first flips, the market is starting to price a policy mistake, or a Fed that has tightened too far this late in the cycle. How far below zero the spread goes matters too. A curve at -100bp is pricing far more cutting than one that has only just dipped below zero.
Recessions have usually arrived after the curve un-inverts, with the Fed cutting hard at the front end. It looks like good news and it is usually the opposite.
Say the 2-year is at 4.80% and the 10-year at 4.10%, so 2s10s is inverted at -70bp. Eight months later weak payrolls push the Fed toward cuts. The 2-year collapses to 4.05% while the 10-year holds 4.15%, and the curve un-inverts to +10bp. The front end has fallen faster than the long end, which is a bull steepening, and history says that is the moment to get more careful.