Scott Bessent, the US Treasury secretary, has recently asserted control over a key segment of the global financial markets, a feat that has occurred not within the United States but in Japan. At the end of July, the US Treasury, under Bessent’s direction, conducted a rare bilateral currency intervention to support the weakening Japanese yen, a currency known for its significant global trading volume. The Treasury collaborated with Japanese authorities, who had been purchasing yen to bolster its value, by selling euros and buying roughly $500 million worth of yen. Although this amount is modest relative to the size of the global currency markets, it generated a significant shock among market participants.

The intervention drew criticism from some quarters, including US Senator Elizabeth Warren, who questioned the move's efficacy. Bessent responded dismissively to such critiques, offering what he described as a tutorial on foreign exchange fundamentals. Analysts, while acknowledging the unusual nature of the assistance, noted doubts about its sustainability without Japan implementing noticeably higher interest rates. Despite these reservations, the yen appreciated approximately 6 percent since the intervention. This rise has fueled speculation about whether the US Treasury might further engage in supporting the currency alongside or independently of Japanese authorities. Other factors contributing to the yen’s strength include increased expectations of Japanese interest rate hikes and greater domestic purchases of government bonds. Bessent has claimed some credit for this turnaround, stating publicly that he possesses superior insight into the Bank of Japan’s likely monetary policy moves, declaring, “I am the house now.”

However, Bessent has acknowledged the complexity of the challenges ahead, describing his situation as fighting battles on multiple fronts. One key concern is the risk that Japan might resort to selling US government bonds—referred to as “forced unwinds”—to prop up the yen. Such actions could destabilize global financial markets and, in turn, raise borrowing costs for American households and businesses.

While the intervention has helped a key ally, outcomes in the US domestic financial markets have been mixed. The yield on the benchmark 10-year US Treasury note recently climbed above 4.95 percent, nearing a five-year high, with the potential to surpass 5 percent for the first time since before the 2007 financial crisis. Longer-term yields, including the 30-year Treasury, are also elevated above levels not seen since the pre-crisis era. The rise in yields is attributed to multiple influences beyond the Treasury's control, including a surge in oil prices linked to escalating conflict between the US and Iran. Crude oil prices have surpassed $100 per barrel, with diesel prices at the pump averaging around $6 per gallon, fueling persistent inflationary pressures that may necessitate tighter monetary policy.

The longer-term solution to high borrowing costs in the US likely involves significant fiscal adjustments, such as major spending cuts or increased taxation. Yet, the current administration appears reluctant to pursue austerity measures. President Donald Trump recently pledged a $5,000 “dividend” to every American contingent on Republican success in the upcoming midterm elections, a plan estimated by the Committee for a Responsible Federal Budget to cost around $1.2 trillion, or over 3.5 percent of GDP. Regardless of its prospects, the proposal signals an absence of urgency toward fiscal restraint.

Adding to the challenges, the Treasury’s recently announced bond buybacks totaled $6 billion, falling short of the anticipated $10 billion, providing limited relief to the bond market. While the yen intervention has helped Japan, domestic policies under the Trump administration, including foreign relations and fiscal strategies, may exert countervailing pressures on US bond markets. Bessent’s confident declarations mark a striking stance in a complex environment shaped by competing domestic and international financial forces.