The Insane US-Japan Currency Bailout

Watch on YouTube ↗  |  August 15, 2026 at 13:45  |  33:21  |  Patrick Boyle
Speakers
Patrick Boyle — Host / Hedge Fund Manager and Finance Professor

Summary

The video examines the US Treasury's rare July 2026 intervention to prop up the Japanese yen, executed by selling euros rather than dollars. It explains how Japan's low rates and the huge yen-funded carry trade have driven yen weakness and why intervention may only temporarily slow the trend. It also links the yen defense to US borrowing costs, Treasury Secretary Scott Bessent's bet on falling long-term rates, and the eroding Treasury convenience yield.

  • US Treasury intervened to support the yen, selling euros without ECB notification.
  • Yen weakness stems from the US-Japan interest rate gap and the yen-funded carry trade.
  • Intervention initially strengthened the yen but gains faded as the rate gap persisted.
  • US long-term Treasury yields are elevated due to inflation, debt supply, and fading convenience yield.
  • Japan's large Treasury holdings make it central to US borrowing costs.
  • Bessent's reliance on short-term bills is a bet on falling long-term rates.
  • BOJ rate hikes could strengthen the yen but face political resistance.
  • Recent 10-year and 30-year auctions cleared at the highest yields in decades.
Ideas
Patrick Boyle Host / Hedge Fund Manager and Finance Professor 19:58
Long-term Treasuries face higher yields.
US long-term Treasuries are unattractive because inflation remains above target, government debt is near record, deficits are large, and heavy issuance has eroded the Treasury convenience yield. With Japan the largest foreign holder of US Treasuries, any yen-defense selling could push yields higher. Recent 10-year and 30-year auctions cleared at the highest yields since 2007 and 2001, confirming rising borrowing costs. This supports short long-term US Treasuries.
Patrick Boyle Host / Hedge Fund Manager and Finance Professor 31:31
Intervention fails; yen resumes slide.
The US Treasury's intervention to prop up the yen is unlikely to change the underlying trend. The yen has been weak because of the large US-Japan interest rate gap, and intervention only buys a few days. After the $88B intervention, the yen quickly gave back about half its gains, and once the rate gap reasserts itself, the yen should resume sliding. This supports short yen / long USD-JPY.
Patrick Boyle Host / Hedge Fund Manager and Finance Professor 31:31
Intervention fails; yen resumes slide.
The US Treasury's intervention to prop up the yen is unlikely to change the underlying trend. The yen has been weak because of the large US-Japan interest rate gap, and intervention only buys a few days. After the $88B intervention, the yen quickly gave back about half its gains, and once the rate gap reasserts itself, the yen should resume sliding. This supports short yen / long USD-JPY.
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