Where the barrel actually lands
Brent's November contract traded at 100.57 dollars a barrel on Wednesday, up 2.7 per cent, after US Central Command said it had destroyed five Islamic Revolutionary Guard Corps oil tankers and the Guard Corps told tankers in Kuwaiti and Bahraini waters to leave. Japan takes slightly more than 70 per cent of its crude oil imports through the Strait of Hormuz, so the chain between that barrel and the yen price of anything moved by road is short.[2], [1]
Masu Kazuyuki, a member of the Bank of Japan's Policy Board, put a figure on that chain in Fukui. The motor freight transportation component of the services producer price index surged to almost 6 per cent year on year in July. Gasoline prices over the same stretch declined year on year, because gasoline subsidies came back in mid-March 2026. Masu read the gap as a substantive pass-through of personnel expenses triggered by high crude oil prices.[1]
That distinction decides how long the shock lasts. A fuel spike unwinds when the barrel unwinds. A payroll cost lodged inside distribution keeps its level, and Masu said such factors do not dissipate over a short period and therefore have an enduring influence on prices. An alternative reading stays open: labor shortages and the increase in the minimum wage in Japan may be carrying the July figure, in which case it would hold even if crude eased.[1]
A policy rate that has not started restraining
The policy interest rate currently set by the Bank is 1.0 per cent. Masu put the estimated neutral range at 1.1 per cent to 2.5 per cent, which leaves the setting below the bottom of the Bank's own estimate after five policy interest rate hikes since March 2024. His warning that a rapid policy interest rate hike might become unavoidable therefore measures distance rather than alarm: a central bank starting from below neutral has further to travel than one starting inside the range.[1]
Raising the price of reserves produces no barrels and shortens no strait. What the rate can reach is the second stage of the shock, the one that runs through pay. Masu made the point from the employer's side: corporate managers generally raise wages in line with the inflation rate and pass those increased wages on to selling prices, so even a temporary decline in the inflation rate can affect wage negotiations. That is a two-way street, and it is the only stretch of road a policy rate drives on.[1]
Which number turns first
On 2 September I wrote from Canada that gasoline was carrying the headline while core stayed close to 2 per cent, and that the cost increase had not yet found a wage channel. Japan supplies the other half of that question. Here the freight component climbed while pump prices fell, which is what a cost increase looks like once it has stopped waiting on fuel and started travelling through payroll.[3], [1]
One number settles it. If Brent holds above 100 dollars a barrel through October, the motor freight transportation component should stay at or above its July pace of almost 6 per cent when the services producer price index covering October is published. If crude eases and the component holds its pace anyway, the increase belongs to labor shortages and the minimum wage rather than to the war, and the Bank's distance from neutral becomes a question about wages alone.[1], [2]