Why a Weak Yen Is America’s Problem

The U.S. and Japanese governments have launched a historic, coordinated intervention to stabilize the Japanese yen following its descent to a 40-year low against the dollar. This move underscores the global risks posed by the yen’s weakness, which stems largely from a massive $4 trillion "carry trade" where investors borrow cheap yen to fund higher-yielding assets abroad. Because Japan is a major holder of U.S. Treasuries, efforts to prop up the currency threaten to push U.S. bond yields higher, increasing borrowing costs for American consumers. While government intervention provides temporary relief, the long-term stability of the yen depends on the Bank of Japan narrowing the significant interest rate gap between Japan and the rest of the world. Without decisive rate hikes, the yen remains vulnerable to persistent selling pressure from global investors seeking better returns elsewhere.