Invest1 publisher2 min readPublished
Tokyo's midnight rate check pulls dollar-yen from 158 back to 156
The Bank of Japan's policy rate is at a 31-year high and the yen still weakened into the 158 range after the decision. Word of a government rate check around midnight on the 19th brought it back to 156, with the holiday running to the 23rd.
The Investor · Invest desk
What happened
- The Bank of Japan has raised its policy rate to the highest level in 31 years, and the yen stayed unstable afterwards, with currency authorities preparing for intervention, en.sedaily.com reported.
- The Japanese government and the BOJ ran an abrupt rate check around midnight on the 19th, Tokyo time, asking multiple financial institutions about levels in the yen-dollar market, per the Nihon Keizai Shimbun.
- Dollar-yen had climbed into the 158 range after the rate decision and fell back to the 156 range once news of the rate check reached the market.
- Caution is spreading that Japanese authorities may step in to buy yen during the break, when thinner liquidity could widen swings and accelerate the currency's decline.
Compiled by The InvestorSomething wrong?How this is made
Why it matters
- decision Anyone holding a short-yen carry position has to decide whether to keep it through roughly four days in which the desk that recovered 1.3 percent with phone calls can trade instead of ask.
- constraint Tightening to a 31-year high did not hold the currency, so the yen's path over the holiday turns on the Ministry of Finance's willingness to commit reserves.
- exposure A thinner book gives both sides more price for the same flow, so stop levels and hedge triggers calibrated for normal liquidity are reachable on order sizes that would usually pass unnoticed.
- precedent A verbal step that recovered about 2 yen without spending anything makes the next warning cheaper to issue, and raises the size an actual intervention has to reach before the market treats it as real.
Nothing was spent on the 19th. Officials made calls, the story ran, and the pair came back from the 158 range to the 156 range, about 2 yen, or roughly 1.3 percent of the rate [4][5][8]. A policy rate at a 31-year high had left the currency weaker than the level it traded at before the decision [1][4].
So the operative lever this week sits with the Ministry of Finance. The account of the check comes from the Nihon Keizai Shimbun and other outlets, reported on the 20th, and the reports leave out the level the authorities asked about [2]. A rate check, in which officials verify trading conditions and quotes at banks, is generally described as the step immediately before intervention [3].
Domestic trading falls away through the 23rd and foreign exchange liquidity can thin out, which the account says could widen swings and accelerate the yen's decline [6][7]. Counting from the midnight calls to the end of the break, that is about four days [9]. Thin books are symmetric. A seller pushing the rate toward 160 gets more movement per unit of flow, and so does an official buyer of yen, which is the case for acting inside the holiday, while the book is still thin.
Officials buy yen and the thin book hands them an outsized move for the money. Nobody buys anything, the 156 range holds, and the phone calls turn out to have been the whole policy. Or the market tests the level, the pair trades back through 158, and the intervention arrives later at a worse entry.
If it comes, I would expect it inside the break, for the reason above: the same money moves the rate further when domestic flow is absent [6]. That view is wrong if the 156 range holds to the 23rd with no official yen buying disclosed, in which case a four-day hedge against intervention cost carry and returned nothing [9]. It is also wrong in the other direction, and more expensively, if the check was a bluff that the authorities were never going to follow, because the next one will be priced as such.
The Ministry has not committed reserves or named a line it will defend, and it has bought itself a second free warning it can issue at any point before the 23rd [2][3].
What to watch
- Any official confirmation that yen was actually bought during the break, against an account that so far rests on press reports.
- Whether dollar-yen trades back above the 158 range once domestic flow returns after the 23rd.
- A second rate check before the holiday ends, which would indicate the first one stopped holding the rate.