Intervention buys the Japanese Yen less ground every time

The Yen had its best session in weeks on Wednesday and it still looks like a losing position. USD/JPY printed just above 160.00 in Asian hours, the highest since the last days of July, then reversed more than two Yen to trade near 158.50 on nothing more concrete than a meeting readout and renewed intervention chatter. The 158.50 shelf gave way by roughly thirty pips before the pair reclaimed it.

What the deterrent costs now

Six weeks ago Tokyo and Washington ran the first joint Yen-buying operation since 1998, and the invoice was enormous. Reported Japanese selling ran near $60 billion on the Thursday and $25 billion on the Friday, with a further tranche the following Monday and an American leg sized in the region of $5 to $10 billion. The pair fell from close to 164.00 to a low near 155.25.

That is roughly nine Yen for more than $100 billion of reserves, and five weeks later the tape was back above 160.00 with almost all of it given away. Wednesday's two-Yen drop cost nothing at all, arriving on a readout of a meeting between Japan's finance minister and the US Treasury Secretary in which both sides agreed that orderly moves matter. The deterrent is getting cheaper and smaller at the same time, which is what happens when a market stops trading a level and starts trading a speed limit.

Firepower is not the binding constraint, which is the part the market has correctly worked out. Tokyo secured access to a Federal Reserve facility that lets it raise Dollar liquidity against Treasury collateral rather than selling the bonds outright, so the reserve position is not the ceiling on how often it can act. What limits the defence is that every operation sells into a fundamental picture that refills the trade within weeks. Ammunition is abundant. Durability is the missing ingredient.

The differential is being set in the bond market

The 10-year Japanese government bond yield reached 3% this week for the first time since 1996, and on any conventional reading that should be the Yen's rescue. It is not, because the move is being driven by an expansionary fiscal programme and the debt service arithmetic that comes with it, rather than by expectations of tighter policy. Bond investors are pricing supply. Currency investors are pricing the same thing and reaching the opposite conclusion.

The one lever that genuinely changes the carry is the September 18 Bank of Japan decision, and the signals point one way. The Governor has flagged that upside price risks deserve more weight, Washington has been openly pressing for a move, and imported inflation is running through an energy bill the conflict keeps inflating. Even a quarter point leaves the gap to a Federal Reserve priced around two thirds for a hike on September 16 more than two and a half percentage points wide.

The American labour week decides the retest

Thursday delivers initial jobless claims at 12:30 GMT with a 205K consensus against 203K, and the Institute for Supply Management (ISM) services Purchasing Managers Index (PMI) at 14:00 GMT, seen at 54.3 against 54.1 with prices paid last at 70.3. Wednesday's private payrolls miss at 38K against a 47K consensus did not dent the Dollar, which is the clearest evidence available that this market is trading the inflation leg of the mandate rather than the employment leg.

Friday's nonfarm payrolls at 12:30 GMT carry a 58K consensus against a prior reading of 23K jobs lost, with unemployment seen at 4.1% and average hourly earnings at 0.3% on the month. A firm print puts the pair back at 160.00 inside a fortnight of the Bank of Japan meeting, and it does so from a starting level the authorities have already described as disorderly once this summer. That is the setup worth watching, because it forces a decision from Tokyo before the policy tool arrives. Two Federal Reserve officials speak on Thursday, at 12:30 and 19:00 GMT, and either one can move the front end of the American curve far enough to matter here.

Levels and bias

Resistance: The 160.00 handle carries the 50-day Exponential Moving Average (EMA) almost exactly and doubles as the zone that draws official comment, so the first test above it is a policy event rather than a technical one. Beyond that, 160.50 is the nearest clean level, and the late-July peak near 164.00 is the only structure left above it.

Support: The 158.50 area is the floor that matters and it held on a retest Wednesday, with 158.00 beneath it. The 200-day EMA near 157.50 is the level a genuine trend change would need to break, and the intervention low near 155.25 sits well below anything the tape is currently negotiating.

Bias: Bullish while 158.50 holds. The Stochastic Relative Strength Index (Stoch RSI) near 87 argues the upside is stretched in the short run, and it should be, because the rate gap does the work here and momentum readings do not. Official action caps this pair rather than reversing it, and a daily close beneath 158.00 is the only thing that would change that reading.

USD/JPY daily chart