US stocks face a quiet but serious risk from the bond market, where the 30-year Treasury yield hit its highest level since 2007. Rising yields act like a slow tax, making borrowing costlier and pulling money from stocks; they reflect heavy borrowing, sticky inflation and a flood of corporate debt. The government had to announce large buybacks of long-term bonds to push yields down, which worked for now. A high yield is not a crash by itself, but it is a warning light. x.comÂ