The U.S. Treasury will at least double its government bond buybacks from Sept. 9 through Nov. 4 and is preparing to expand repurchases of high-cost long-term debt. It also plans to issue short-term bills as part of a shift toward shorter-term borrowing to ease financing pressure. James Sullivan, co-head of global fundamental research at JPMorgan Chase, compared the strategy to using a credit card to pay a mortgage, saying it cannot resolve the underlying problem of roughly $40 trillion in federal debt. Friedrich Schaper, a strategist at Goldman Sachs, said the impact of larger buybacks would be relatively short-lived unless macroeconomic drivers such as inflation change. He said continued moderate inflation data and stronger market expectations that the Federal Reserve will keep interest rates unchanged are the main paths to lower Treasury yields.