Japan's currency keeps falling, and Tokyo is running out of easy answers. The yen has weakened to around 162 per US dollar, its softest level in roughly four decades — a low not seen since the mid-1980s — Investing.com reported. Traders are watching for the government to step in.
Why the yen is so weak
The driver is simple: the yen pays little, so money leaves it. The US Federal Reserve has kept its benchmark rate up in the mid-3% range, while the Bank of Japan (BoJ) — even after slowly raising rates toward around 1% — sits far below. That gap of roughly two-plus percentage points is what currency markets fixate on.
The mechanism is the "carry trade": investors borrow cheaply in yen and park the money in higher-yielding assets abroad, pocketing the difference. The more the yen falls, the more attractive that trade looks — a self-reinforcing loop. The BoJ's rate hikes were meant to ease the pressure, but as long as the rate gap stays wide, the pull on the yen persists. (An exchange rate like USD/JPY tells you how many yen one dollar buys; a higher number means a weaker yen.)
Intervention — and its limits
Japan has fought back. Authorities spent on the order of ¥11.7 trillion (roughly $70 billion-plus) buying yen in recent weeks — among the largest interventions since 2024 — yet the currency soon resumed sliding, per the reporting. The problem with intervention is that it can slow a move but rarely reverses one driven by fundamentals like the rate gap.
Officials have leaned on verbal warnings, and there are signs of cross-border coordination: Japan's finance minister and US Treasury Secretary Scott Bessent reportedly discussed taking "bold" steps on currencies if needed, Bloomberg reported — a signal markets read as raising the odds of action. (Names and exact figures are per that reporting.)
Why it cuts both ways
A weak yen isn't all bad for Japan. Exporters — automakers, electronics firms — earn more when foreign sales are converted back into cheaper yen, and it flatters their profits. But for households and smaller firms, it bites: a weak yen makes imports more expensive, especially energy priced in dollars, pushing up prices and eroding real incomes. The BoJ has itself flagged the risk that inflation runs hotter than its 2% goal partly because of the weak currency — which is exactly the bind: defending the yen argues for higher rates, but Japan's economy and debt load make the BoJ cautious about moving fast.
Why it matters
For global markets, the yen is more than a domestic story. It's one side of the world's biggest carry trade, and a sudden, sharp reversal — if intervention or a BoJ surprise forces traders to unwind positions fast — can ripple through stocks and bonds worldwide, as a violent yen snap-back did in 2024. For now, the move is grinding, not crashing, and Tokyo's tools are limited: talk, intervene, or raise rates into a fragile economy. Boursel makes no call on where the yen goes next; the takeaway is that a four-decade-low yen is both a symptom of the global rate gap and a risk factor markets will be watching for any sign of a disorderly break.
