The yield on the 30-year US Treasury reached 5.47% in the Treasury's September 24 daily data, up from 5.40% a day earlier. That is a meaningful move for the bond investors use to think about decades of inflation and government borrowing. Buying a 30-year bond means agreeing today on the return you will accept for a very long time. Investors are asking for more of it.
What it means: Why do bond prices fall when yields rise? A bond's fixed payments become less appealing when newly issued bonds offer higher returns, so its market price falls until its yield becomes competitive.