The US Treasury’s decision to expand purchases of older long-dated government bonds has reignited concerns in foreign-exchange markets that efforts to contain rising borrowing costs could eventually shift pressure onto the dollar, according to a report by Reuters. On Wednesday, the Treasury said it would at least double the maximum size of certain buyback operations to $4 billion.

The purchases are aimed at older, less-liquid Treasury securities that have come under heavy selling pressure since late June. Treasury Secretary Scott Bessent subsequently indicated that the buyback could exceed $4 billion, while suggesting that the recent bond selloff had moved too far.

S. policymakers are prepared to allow long-term borrowing costs to rise to levels demanded by markets or whether they will increasingly intervene to limit the increase..

However, the latest announcement has attracted greater attention because of its timing and expanded scale. The decision came outside the Treasury’s regular quarterly refunding schedule and shortly before a 20-year Treasury auction.

S. bond market is facing several headwinds.

S. fiscal outlook, heavy government debt issuance, geopolitical risks and uncertainty over the Federal Reserve’s future interest-rate path.

S. public debt surpassed $40 trillion.

The development has created a difficult policy choice. If authorities allow yields to rise freely, the government could face significantly higher borrowing and debt-servicing costs.

But if policymakers take steps to suppress long-term yields, investors may demand compensation elsewhere, potentially putting pressure on the dollar. S.

currency. The concern is not necessarily about outright monetary financing, in which a central bank creates money to fund government spending.

Instead, investors are focused on the possibility that policymakers could use bond buybacks, a greater reliance on shorter-maturity debt or other measures to reduce the amount of long-duration Treasury securities that private investors need to absorb. Such policies could shift part of the adjustment away from bond yields and toward the currency.

The reaction in alternative assets has reinforced those concerns. Gold gained more than 3% following the Treasury announcement, while Bitcoin advanced sharply over a two-day period, reflecting increased interest in assets viewed by some investors as alternatives to traditional government debt and fiat currencies.