Jenga Tower of Debt: Yen Carry Trade on Brink of Collapse

The recent U.S.-Japan joint intervention to prop up the yen has fallen short of expectations, leaving markets concerned about the currency's stability. The intervention saw the U.S. buying $5 billion-$10 billion worth of yen and Japan moving $50 billion. Initially, the exchange rate strengthened to around 157 yen per dollar from nearly 164 but has since given back some gains.

The underlying causes of the yen's weakness remain unaddressed, including Japan's massive debt exceeding 200% of GDP, fiscal stimulus that worsens the deficit, and a central bank slow to raise rates in the face of high inflation. The intervention was seen as short-term measures to address symptoms rather than root causes.

Wall Street veteran Ed Yardeni described the financial system as a 'giant Jenga tower' with the yen as a load-bearing piece. He warned that traders are watching the 'yen carry trade,' where cheap yen borrowing funds bets on higher-yielding assets worldwide, and wondering if it's about to blow up.

Experts like Robin Brooks, senior fellow at the Brookings Institution, have been sounding the alarm on the yen for a while, warning its extended slide is actually a sign of a simmering debt crisis. He called for a 'profound shift' in the Bank of Japan's policy, including long-term yields on Japanese government bonds rising to narrow the gap versus U.S. yields.