Mortgage rates are starting off this week with a nice drop, though the likely reason for the fall could be a little anxiety-inducing.

The average interest rate on a 30-year, fixed-rate mortgage dropped to 7.20% APR, according to rates provided to NerdWallet by Zillow. This is 15 basis points lower than Friday and 12 basis points lower than a week ago. (See our chart below for more specifics.) A basis point is one one-hundredth of a percentage point.

Rates started this slide last week, as investors' previously sky-high confidence in AI came a little closer to earth. Tech stocks lost a bit of their luster, and bonds looked more appealing. Greater demand for bonds pushed up bond prices, dropping bond yields (they move inversely). And mortgage rates are often indexed to the yield on the 10-year Treasury so, huzzah, lower mortgage rates.

On one hand, yay! But on the other hand … uh, what was that about stocks?…