Japan's intervention to support the weakening yen has paradoxically strengthened the carry trade, the strategy where investors borrow in low-yielding currencies like the yen and invest proceeds in higher-yielding assets elsewhere.
The Bank of Japan's efforts to arrest the yen's decline against the dollar have created what traders call a "turbo-charged" environment for carry trade positioning. By defending the yen, authorities inadvertently signaled they would prevent further sharp depreciation, reducing downside risk for carry trade participants. This lower perceived risk encourages investors to re-engage in borrowing cheap yen and deploying capital into American equities, emerging market bonds, and other higher-yielding instruments.
The carry trade exploded in 2024 after the BOJ maintained ultra-loose monetary policy while the Federal Reserve began tightening. The strategy unraveled violently in early August when the BOJ signaled policy normalization, triggering a funding squeeze. Investors rushed to cover short yen positions, forcing asset sales across global markets and sparking a sharp equities selloff.
Japan's intervention since August has reversed some of that damage. By actively defending the yen floor through dollar selling and forward guidance, the BOJ reduced the threat of another sudden funding crisis. Traders now view the carry trade as less toxic, reopening positions that many had abandoned.
This creates a feedback loop. More carry trade activity weakens the yen again, potentially forcing additional BOJ intervention to maintain stability. Each intervention reinforces the carry trade's viability.
For markets, this matters considerably. The carry trade connects Japanese funding to global risk assets. When participants unwind positions rapidly, volatility spikes across equities, bonds, and currencies simultaneously. Conversely, renewed carry trade positioning lifts demand for stocks and emerging market assets but leaves markets vulnerable to another reversal if BOJ intervention falters or