Yen Intervention Triggers Shared Debt Doom Loop Crisis

The yen has fallen to its lowest level against the US dollar in 40 years, touching 164 to one USD at one point. Analysts attribute this to the differential between US and Japanese interest rates, but note that the Federal Reserve has kept interest rates unchanged. In response, the US Treasury Secretary Scott Bessent announced a coordinated currency intervention with Japan for the first time since 1998. The Bank of Japan sold $76 billion to $82 billion worth of US dollar bonds to support the yen, causing the Japanese government debt to rise by 1/3.

US long-term bond yields rose due to increased sales, putting upward pressure on all interest rates, including mortgage rates. This would affect residential property sales and household confidence. The net reduction in Japanese holdings of US Treasuries between February and May 2026 is roughly equivalent to the estimated Japanese intervention to defend the yen.

The shared debt doom loop refers to a growing debt servicing trap where lenders demand higher interest rates when governments cannot afford rising debt. This crisis looms over both the US and Japan, with their massive government debts. The average interest rate on federal debt in the US has risen above the economy's nominal growth rate of 3.8%, threatening to compound faster than the nation can pay it down.

US Treasury Secretary Bessent warns that if the yen depreciates further, other Asian currencies may follow suit, pushing the dollar higher and worsening US trade deficits. The global fiscal and trade imbalances are set to be discussed extensively at this month's meeting of central bankers at Jackson Hole.