This Fed-based market signal is flashing a warning for the first time in over a decade. Here’s why it matters.

The major indexes improved from morning lows. Trump Media stock gave back more than 8% of Monday's 16.6% gain.

Investors have shifted toward traditional safe-haven assets like gold and Treasury bonds in the wake of recent uncertainty over the Ukraine-Russia conflict.

Live updates on stocks, bonds and markets, including the Dow Jones Industrial Average, S&P 500 and Nasdaq Composite.