Bank of Japan Governor Kazuo Ueda has issued a stark warning about the potential for oil price shocks to trigger lasting inflation, emphasizing that central banks must consider broader economic factors beyond isolated energy movements. According to reports from Reuters, Ueda stated that temporary energy shocks can evolve into persistent inflation if they begin influencing wages, consumer expectations, and corporate pricing behavior. Speaking at the 2026 BOJ-IMES Conference in Tokyo, Ueda argued that the impact of oil price spikes depends heavily on the economic environment in which they occur. As per Reuters, Ueda warned that central banks should not assess oil price movements in isolation, arguing that temporary energy shocks can evolve into persistent inflation if they begin influencing wages, consumer expectations, and corporate pricing behavior. "A temporary shock can become persistent if it changes wages, expectations, and price-setting behavior. Conversely, a large shock can remain temporary if those channels do not activate," Ueda told the conference, while noting that "Japan's experience shows that oil price shocks are never just oil price shocks. They are tests of the entire inflation regime."
As reported by Reuters, Ueda explained that identical increases in oil prices can produce very different effects on inflation, wages, demand, and exchange rates depending on prevailing inflation expectations and wage growth trends. He noted that when inflation expectations are already elevated and wages are rising rapidly, the possibility of broader second-round inflationary effects becomes significantly stronger. In contrast, even a major energy cost shock may fail to generate sustained inflation if wages remain stagnant and inflation expectations stay subdued. The governor emphasized that "the boundary between temporary and persistent inflation is not mechanical," as the same oil price increase can have very different effects depending on initial conditions. The comments come at a time when rising oil prices linked to the ongoing Middle East conflict are adding to inflationary pressure in Japan, with Japan's core inflation as measured by a new central bank gauge accelerating in April and blowing past its 2% target, as reported by Reuters.
According to Reuters, Ueda described the current surge in oil prices resulting from the U.S.-Israeli conflict involving Iran as Japan's 'fifth oil price shock', drawing important lessons from earlier episodes of energy-driven inflation. Reflecting on Japan's first oil shock in 1973, Ueda said inflation was already running close to 10% before the crisis struck, eventually driving wage and price growth to nearly 20% a year later. He acknowledged that the BOJ tightened monetary policy during that period, but the response came too late and was insufficient to prevent inflation from becoming entrenched. By comparison, Japan's second oil shock around 1979 and 1980 produced a much more moderate inflation response due to quicker monetary tightening and lower underlying inflation at the time. Ueda attributed that outcome not only to quicker monetary tightening by the central bank, but also to lower underlying inflation and more restrained wage behavior at the time, as well as the role of a stronger yen in reducing import costs during that period. During the mid-2000s oil surge, Japan's deflationary equilibrium meant higher energy costs acted as an income tax rather than triggering broader inflation, with core CPI remaining negative throughout that period. The post-2021 episode was different, as a broader shock spanning energy, food and logistics, combined with yen depreciation, tighter labour markets and shifting price norms, moved Japan away from its deflationary equilibrium without producing a 1970s-style spiral.
As reported by Reuters, Ueda contrasted the recent inflationary impact of the Ukraine war with the third oil shock seen in the late 2000s, noting that supply disruptions following the Ukraine conflict resulted in broader price increases across the economy, with inflationary pressures amplified by yen weakness. According to Ueda, the recent period has altered the inflation mindset of Japanese businesses and households, making companies more willing to raise prices and workers more inclined to demand higher wages. The governor stressed that oil price shocks should be viewed as broader tests of an economy's inflation dynamics rather than isolated commodity events. The situation has prompted growing expectations in financial markets that the BOJ could raise interest rates as early as next month, with pricing in the overnight swaps market indicating a roughly 75% chance of a quarter-point hike next month. Mizuho Financial Group Inc.'s Chief Executive Officer Masahiro Kihara suggested Wednesday that an outsized interest rate increase might be better for the bond market. Ueda's framing of the current Middle East conflict as a 'fifth oil shock' carries direct policy implications for the BOJ's rate path, with his emphasis on initial conditions as the decisive variable signaling that the central bank is watching wage growth, inflation expectations and exchange rate dynamics as closely as the oil price itself.
According to Reuters, Ueda highlighted how Japan's currency weakness has significantly amplified the impact of oil price shocks, particularly noting the role of yen depreciation during the Ukraine invasion in 2022. "Energy and food prices rose, global supply chains were disrupted, and Russia's invasion of Ukraine intensified pressures on commodities," Ueda said. "For Japan, yen depreciation further amplified the rise in import prices." This comment comes as the yen has weakened considerably from its 2022 levels, with Japan's currency trading around 159.22 per dollar Wednesday morning in Tokyo, while averaging around 157.59 so far in 2026. In contrast, for all of 2022, the yen averaged 131.55 to the dollar. The currency hit the lowest level Tuesday since April 30, when Japan's Finance Ministry intervened in the currency market to support the currency. Ueda's remarks about the need for vigilance over oil price spikes' impact on underlying inflation trends, without dropping clear signals about policy path, will likely support broad speculation in the market over prospects for an interest rate increase when authorities next set policy on June 16.
