US Joins Rare Yen Intervention, Signals Concern Over Global Economic Stability

The United States has joined Japan in a rare coordinated effort to support the yen, marking the first joint intervention by the two countries since 1998.

The move immediately helped the battered Japanese currency rebound from its weakest level against the U.S. dollar in nearly four decades.

Economists say the operation was about more than foreign exchange markets; it reflects growing concerns over the stability of U.S. Treasury markets, Japan's financial system, and the broader global economy.

Louise Loo, head of Asia economics at Oxford Economics, said one motivation for U.S. participation was preventing Japan from having to sell large amounts of its U.S. Treasury holdings to finance unilateral currency intervention.

This is significant because Japan is the largest foreign holder of U.S. government debt; any large-scale liquidation of Treasuries could increase volatility in the U.S. bond market and ultimately destabilize the dollar.