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What the US-Japan Currency Intervention Means for the Yen, Rates, and the Dollar

August 13, 2026

AI Summary

5 min read

In late July 2026, Japan and the United States conducted their largest coordinated currency intervention in 15 years, selling US dollars to buy Japanese yen. The move came after more than five years of yen weakness, with the currency hitting four-year lows against the dollar. Goldman Sachs researchers Karen Fishman and Pranit Shah break down what happened, why the US participated, and whether the intervention can actually work.

Why the Yen Has Been So Weak

The yen's prolonged weakness stems primarily from Japan's domestic policy mix. The government has pushed through large spending plans while the Bank of Japan has raised interest rates only very gradually. Markets view that combination as inflationary — the rate hikes are insufficient to contain rising inflation risk. When inflation rises and rates don't keep up, real returns fall, so investors move money elsewhere or bet against the yen.

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What you'll learn

  • 1 (00:49) **What Happened and Why It’s a Big Deal** - Karen Fishman explains the July 30th coordinated US-Japan FX intervention, the largest in 15 years.
  • 2 (02:31) **Why the Yen Has Been So Weak** - Karen breaks down the main drivers of the prolonged yen depreciation.
  • 3 (03:45) **Why Japan Wants a Stronger Yen** - Karen explains the negative consequences of a weak yen for Japan’s economy.
  • 4 (04:28) **Why the US Joined the Intervention** - Karen presents the debate over US motives, arguing it’s more about market stability than yen levels.
  • 5 (08:00) **On the Trading Floor During the Intervention** - Pranit Shaw describes the market’s shock and the mechanics of the intervention.
  • 6 (10:14) **Client Reactions and Position Squaring** - Pranit details how leveraged investors were forced to react.
  • 7 (12:14) **Euro-Yen as a Key Cross** - Pranit notes a shift in client focus toward the euro-yen exchange rate.

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Show Notes

The US and Japan coordinated on the biggest currency market intervention in 15 years, helping to stabilize a weakening yen. Karen Fishman, senior FX strategist in Goldman Sachs Research, and Praneet Shah, global head of FX options trading in Global Banking & Markets, discuss why the US joined the action, why the yen still appears undervalued, and whether another intervention might follow.

Key takeaways: 

  • The scale of Japan’s intervention was historic, but the US role was symbolic.  Japan's operation, estimated to be worth up to $85 billion over July 30 and July 31, was its largest two-day intervention on record outside of October 2011. The US leg was much smaller, but pushed the yen further by signaling the US’ willingness to help. 
  • Washington's involvement was likely aimed at limiting volatility in US markets. The timing of US support coincided with some volatility in US interest rates, in addition to other factors. 
  • Intervention may buy time, but it is a short-term measure. In the longer term, policy measures convincing Japanese investors to shift back towards Japanese assets could help reverse the yen's low valuation. 

This episode was recorded on August 10, 2026.

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