The Rule That Drove the Japanese Yen for Decades Just Broke, Apollo Says

For years, one number told traders where the Japanese yen (JPY) was heading. That number was the gap between US and Japanese interest rates. Apollo Global Management says it no longer works.

Chief Economist Torsten Slok says the yen carry trade broke down after April 2025. Japan's debt bill now moves the currency instead.

Why the Japanese Yen Stopped Tracking Interest Rates

The trade was simple. Investors borrowed yen at near-zero rates. They bought dollar assets paying far more. They kept the difference.

That flow tied the dollar-yen rate to the yield gap. A wider gap pushed the yen down. A narrower one pulled it back up.

Apollo's chart tracks the two lines moving together from January 2021 until the break. Slok says the link held for decades.

Slok dates the break to Liberation Day, the April 2, 2025 rollout of sweeping US tariffs. Volatility jumped, and the trade stopped paying.

The math is unforgiving. A carry position earns a little each day. One sharp yen rally can erase a year of that. So traders cut exposure even while the gap stayed wide.

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