Japan Has Not Done This Since 1990. If It Happens, the Cheap Money Propping Up US Stocks Gets Expensive
A single public comment from a Bank of Japan official sent the yen surging and rattled a cornerstone assumption holding up American equities, and the policy lever traders are now watching has not been pulled in over three decades.
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The Japanese yen jumped sharply overnight into September 3, and traders watched for currency intervention that never materialized. USD/JPY closed at 155.79 that day after trading as low as 155.28, down from 158.70 the prior session and from levels above 163 in late July. Bank of Japan account activity suggested no major intervention on Wednesday.
A board member said publicly that the central bank could consider a larger-than-usual rate hike, and the currency repriced within hours. Cheap yen funding has quietly supported risk-taking in American equities for years, and the assumption that Japanese policy was frozen through the fall now looks wrong. The SPDR S&P 500 ETF Trust (NYSEARCA:SPY) sits up 13.38% year to date on the assumption that global financing conditions stay accommodative. That assumption is being tested.
What Was Actually Said
Speaking on Bloomberg’s The Asia Trade, strategist Mark Cranfield said, “Most likely it was the comments from the Bank of Japan yesterday. He said that the Bank of Japan could consider a bigger than usual interest rate move.” He continued: “Some people are speculating that there is a chance they will discuss a 50 basis points increase in rates rather than the normal 25 basis points and he raised the possibility that they could do back to back interest rate hikes as well.”
Fifty basis points is half a percentage point in a single meeting, twice the size of a standard move. Back-to-back means two hikes at consecutive meetings rather than the usual one-and-wait pattern. Markets had priced nothing in for the next two Bank of Japan policy meetings.
Why a Known Hawk Changes the Signal
Cranfield described the speaker: “He is a hawk. He’s voted consistently for rate hikes to some extent but this is the first time publicly that this could be a bigger than 25 basis points hike.” A hawkish vote recorded inside a policy meeting is a data point historians read later in the minutes. A hawkish signal delivered in public moves a currency the same day.
Central bankers do not float unprecedented moves casually. The public nature of the comment gives traders permission to reprice the front end of the Japanese curve without waiting for a formal decision. That repricing feeds directly into the dollar-yen exchange rate, because a wider expected policy path narrows the interest rate gap that has kept the yen weak.
A Thin Market Amplified the Move
Cranfield noted: “On a day where there wasn’t much going on in the foreign exchange market, it’s the week before Labor Day and traditionally a lot of senior traders are not around.” He continued: “A day where you could move the market without too much trouble, which is pretty much what happened in New York.”
Thin trading means fewer participants standing ready to take the other side, so any order pushes prices further than it would in a full market. A move made in an empty market carries limited informational value. The direction is meaningful, and the magnitude should be discounted until senior desks return and reprice on their own terms.
A Policy Tool Japan Has Not Used Since 1990, according to Bloomberg
Cranfield noted that the last time the Bank of Japan raised interest rates by 50 basis points was 1990, so the country would be reaching for a lever a generation of investors has never seen used. Japan spent the intervening decades fighting deflation, keeping rates near zero, and aggressively expanding its balance sheet. A country reaching for a tool it has not used in that long signals something meaningful about its inflation and fiscal situation rather than a routine adjustment.
Japanese government bond yields sit at multi-decade highs. Currency support spending has drawn down reserves. The pressure on the central bank is real, which is why the hawk’s comment landed as hard as it did.
Why a US Retirement Investor Should Care
The yen carry trade connects a Tokyo speech to an American 401(k). Investors borrow in yen at low rates, convert the proceeds to dollars, and buy higher-yielding assets, including US stocks. A stronger yen makes borrowed money more expensive to repay. Higher Japanese rates raise the cost of the loan itself. Both are happening at once.
When the trade unwinds quickly, the selling has nothing to do with any view on the American companies being sold. The VIX at 15.20 suggests the equity market is not pricing this channel today. Japanese bond yields at multi-decade highs also give Japanese institutions a reason to keep capital at home rather than send it into foreign assets, removing a persistent bid US markets have quietly enjoyed, and this comes as the 10-year Treasury yield is at 4.79%, its highest reading of the past year.
Watch the central bank’s September meeting. If policymakers validate the hawk’s language with even a conventional hike and firmer guidance, the repricing extends into US assets. If they retreat to silence, the carry trade earns a reprieve, though not a reversal.
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Omor Ibne Ehsan is a writer at 24/7 Wall St. He is a self-taught investor with a focus on growth and cyclical stocks that have strong fundamentals, value, and long-term potential. He also has an interest in high-risk, high-reward investments such as cryptocurrencies and penny stocks.
