The core price increases for the month include:
- Domestic Producer Price Index (PPI): Surged 2.3% month-on-month, pushing the annual rate up to 4.9%.
- Import Price Index: Rose 4.9% monthly in contract currency terms, but ballooned to 5.6% on a Yen basis, with a massive 17.5% jump year-on-year.
- Domestic Utilities: Electric power, gas, and water rates climbed 8.4% as the energy shock filtered into local infrastructure.
This inflationary spike is primarily driven by an external energy and commodity shock. Import prices were heavily impacted by petroleum, coal, and natural gas, which contributed the vast majority of the contract currency increase. These soaring raw material costs immediately bled into domestic production, triggering significant price hikes in petroleum refining and chemicals.
The data underscores the severe amplifying effect of a weakening Japanese Yen. The massive divergence between contract currency and Yen basis figures confirms that currency depreciation is effectively doubling the inflationary burden on domestic firms. Consequently, these heavy input costs are highly likely to filter down into consumer prices over the coming months, leaving the Bank of Japan to navigate a challenging monetary dilemma driven by external cost pressures rather than booming domestic demand.