October 11, 2026 | Markets and Monetary Policy | TokyoBrainie
A Japanese weekly market preview offered three eye-catching possibilities for the coming week: the Nikkei 225 returning above 70,000, Japan’s 10-year government bond yield slipping below 3%, and the yen strengthening as far as ¥156 per dollar.
Each number is individually possible. The weakness lies in presenting them as if they belong to one coherent base case.
The central problem is not that ¥156 is impossible. It is that the path to ¥156 conflicts with the article’s own Middle East premise unless the scenarios are clearly separated.
THE FORECAST
The published ranges were:
The equity range is reasonable. The currency and bond assumptions are more fragile because they depend on the same variable being treated in two different ways: oil.
THE SCREEN IS NOT THE BARREL
Brent futures near $104 may look calmer than the physical oil market. But a Japanese refiner does not buy a glowing number on a trading screen. It buys a particular grade of crude, at a particular location, for delivery at a particular time, on a tanker that must be available, insured and able to pass through a contested route.
The effective cost therefore includes the futures benchmark, the physical differential, freight, war-risk insurance, rerouting, refinery compatibility and delivery timing.
When the Strait of Hormuz is impaired and tanker attacks are increasing, the futures price can ease while the cost of obtaining usable oil remains painfully high. A decline in the paper benchmark does not automatically become cheaper energy for Japan.
This distinction matters because the weekly forecast treats a pause in oil’s rise as support for bonds. That may be true on the screen. It may not yet be true at the refinery gate.
IS ¥156 IMPOSSIBLE?
No. From roughly ¥158.3, a move to ¥156 requires yen appreciation of only about 1.5%. A clearly softer US CPI report could reduce expectations for another Federal Reserve rate increase, lower US yields and trigger a rapid unwinding of short-yen positions. Official Japanese and US rhetoric against excessive currency moves could amplify it.
Under that specific scenario, ¥156 is a valid lower boundary.
But it is not the natural destination of a fresh Middle East escalation.
A new attack on Saudi infrastructure, tankers or a major shipping route would initially create three pressures: