BREAKING: The US 30 year yield just crashed below 5.20% after the Treasury doubled its long term bond buybacks. The yield hit 5.337% yesterday, a 19 year high, before dropping to 5.189%. A buyback is when the Treasury goes into the market and buys back bonds it already issued. That takes supply out of the market and pushes prices up, which pulls yields down. Treasury is doubling the size of these operations in the 10 to 30 year sector from $2 billion to $4 billion each, starting September 9 and running through November 4. Treasury says this is about liquidity, not the level of yields. The timing still matters. The announcement landed the same week borrowing costs hit their highest level since 2007, and the market read it as the government stepping in to support its own debt.