Energy costs drive up inflation pressure! South Korea's PPI rises 8.5% year-on-year in May, hitting a near four-year high.

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Producer price inflation in South Korea continues to heat up, making market assessments of the Bank of Korea’s monetary policy outlook increasingly complicated.

According to data released by the Bank of Korea on Friday, the PPI rose 8.5% year-on-year in May, marking the biggest annual increase since July 2022. Data for the previous month was also revised upward. Month-on-month, prices increased by 0.8% compared to April, marking the ninth consecutive month of growth. The Bank of Korea noted that this round of price hikes was mainly driven by petroleum and coal products, chemicals, and technology-related manufacturing. Among them, prices for chemical products and computers and electronic products both rose about 20% year-on-year—the latter reflecting the continued strength of the semiconductor sector.

These figures have further reinforced market concerns that inflationary pressures in South Korea remain high. Meanwhile, the Bank of Korea kept its benchmark interest rate unchanged at 2.5% in May but released signals of a tightening bias; minutes of the meeting released earlier this week showed broader support within the committee for this hawkish position.

Energy Shock as the Core Driver

According to Bloomberg, the war in Iran has driven up energy prices, serving as a key backdrop for the recent rapid rise in producer prices. Although the temporary peace agreement between the US and Iran has taken effect, oil prices remain relatively high, and shipments through the vital Strait of Hormuz are expected to take several months—or even longer—to return to normal.

This means the pass-through effect of energy costs on upstream production prices is unlikely to fade in the short term, and the continued rise in petroleum and coal product prices will keep filtering down to the industrial chain.

Semiconductors Drive Up Technology Manufacturing Prices

In technology manufacturing, computer and electronic product prices rose about 20% year-on-year, which the Bank of Korea attributes to sustained prosperity in semiconductor-related industries.

This sub-index shows that the price pressures in the technology manufacturing sector are not driven solely by costs—demand-side factors are also significant, providing extra support for the overall producer price index.

Bank of Korea’s Hawkish Signals Becoming Clearer

Faced with both inflationary pressures and financial stability risks, the Bank of Korea’s policy stance is gradually shifting toward hawkishness.

Although the May rate meeting resulted in no change, the central bank clearly signaled a tightening bias. Minutes released this week further showed expanding support for this position within the committee.

Continued increases in producer prices usually pass through to consumer prices within a few months; if this pattern persists, it will provide more support for future rate hikes by the Bank of Korea. Investors should closely monitor subsequent inflation data and central bank statements.

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