First U.S.-Japan Joint Intervention in Three Decades Fails to Stabilize Yen

What happened

The first U.S.-Japan joint intervention in three decades aimed at boosting the yen occurred without significantly easing market anxiety. The U.S. bought $5 billion-$10 billion worth of yen, while Japan's move topped $50 billion. The exchange rate initially strengthened to about 157 yen per dollar from nearly 164 but has since hovered around 159.

Why it matters

The intervention highlights the yen's deep trouble, described as a 'load-bearing piece' in a 'giant Jenga tower' of global finance. Concerns include Japan's massive debt exceeding 200% of GDP, the Bank of Japan's slow rate hikes, and the risk of a 'yen carry trade' collapse. The tactics also raised questions about the dollar's dominance and the U.S. debt outlook given Japan's $1 trillion+ Treasury holdings.