Global yields fall after US Treasury boosts debt buybacks

NEW YORK, Aug 19 : Longer-dated global bond yields retreated from multi-decade highs, the dollar tumbled and gold jumped on Wednesday after the U.S. Treasury Department said it would boost liquidity support for longer-dated securities, following a broad selloff fueled by fears over swelling sovereign debt.The U.S. Treasury Department said it would double the size of liquidity support buyback operations for longer-dated nominal coupon securities to at least $4 billion per operation from $2 billion.U.S. long-dated government yields fell by as much as 10 basis points, dragging European government bond yields down too. U.S. long bonds had hit their highest in nearly 20 years on Tuesday, at nearly 5.34 per cent, reflecting growing concerns about inflation and high debt."It goes to show a pretty