Japan’s consumer inflation figures get most of the attention, but there is another set of price data that often moves first: producer prices. They measure what companies pay and charge each other for goods, and they can give an early warning of where consumer prices and Bank of Japan policy are heading. For anyone trading the yen, they are worth understanding.
What Japan’s producer price data measures
In Japan, the main producer price measure is the Corporate Goods Price Index, published monthly by the Bank of Japan itself. It tracks the prices of goods traded between companies, including raw materials, energy, intermediate goods and finished products. Separate indices cover export and import prices, measured both in yen and in the currencies used for trade.
Our general guide to producer price indices explains the concept in more detail.
Why the yen and producer prices are linked
Japan imports much of its energy, food and raw materials. When the yen weakens, those imports become more expensive in yen terms, even if global prices are unchanged. Higher import costs then feed into producer prices. That makes producer price data partly a reflection of the currency itself.
The link works in a loop. A weak yen pushes up producer prices. If companies pass those costs on, consumer inflation rises. Higher inflation can push the Bank of Japan towards raising interest rates, which in turn can support the yen.
How producer prices feed consumer inflation
Producer prices tend to lead consumer prices, though the timing and strength of the link vary. Japanese companies have historically been reluctant to raise prices for consumers, absorbing cost increases into their profit margins. That habit has weakened in recent years as cost pressures have built and wages have started rising.
A strong producer price figure therefore raises the question of whether companies will keep passing costs on. If they do, consumer inflation could stay higher for longer, putting pressure on the Bank of Japan. Our guide to underlying inflation in Japan covers what the central bank watches most closely.
What it means for the Bank of Japan
The Bank of Japan spent many years fighting deflation with ultra-low interest rates. As inflation has risen, it has started to normalise policy. Producer price data is one of the inputs that helps it judge whether inflation is becoming self-sustaining or is just a temporary result of import costs. Our explainer on the Bank of Japan covers its approach.
How traders use the data
Producer price releases rarely move the yen as much as consumer inflation or wage data, but a big surprise can shift expectations for Bank of Japan policy at the margin. Traders often look at the year-on-year rate, the monthly change and the import price index in yen terms. A sharp rise driven mainly by a weaker yen is a reminder of the currency’s role in Japan’s inflation story.
When the yen is close to levels where Japanese officials have previously intervened, inflation data can add to the pressure. High import costs are one of the reasons policymakers worry about a rapidly falling currency.
The bottom line
Japan’s producer prices sit at the heart of a loop connecting the yen, import costs, consumer inflation and Bank of Japan policy. They are an early signal rather than a headline event, but they help explain why a weak yen can become a policy problem. If you want to understand how you join the dots between data and currencies, take the free Samuel & Co Trading trader assessment.
