Energy costs drive inflation pressure! South Korea's PPI rose 8.5% year-on-year in May, hitting a nearly four-year high

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

According to data released by the Bank of Korea on Friday, the Producer Price Index (PPI) in May rose by 8.5% year-on-year, marking the largest annual increase since July 2022, with previous month data also revised upward. On a month-on-month basis, prices increased by 0.8% from April, registering the ninth consecutive month of growth. The Bank of Korea noted that the recent price surge was primarily driven by petroleum and coal products, chemical products, and technology-related manufacturing industries. Among them, both chemical products and computer & electronic products prices rose about 20% year-on-year, with the latter reflecting the sustained strength in semiconductor-related industries.

This data further intensifies market concerns over persistent inflationary pressures in South Korea. Meanwhile, the Bank of Korea kept its benchmark interest rate unchanged at 2.5% in May but signaled a tightening bias. Minutes released earlier this week showed broader committee support for this hawkish stance.

Energy Shock as Core Driver

According to Bloomberg, the Iran war has driven up energy prices, serving as an important backdrop for the accelerated rise in producer prices. Although a temporary peace agreement between the US and Iran is already in effect, oil prices remain relatively high and cargo flows through the key shipping channel of the Strait of Hormuz are expected to take months or even longer to return to normal.

This suggests that the pass-through effect of energy costs to upstream production prices will be difficult to dissipate in the short term, with the continued rise of petroleum and coal product prices set to further penetrate downstream into industrial value chains.

Semiconductors Drive Up Tech Manufacturing Prices

In the technology manufacturing sector, computer and electronic product prices increased about 20% year-on-year, which the Bank of Korea attributes to the continued prosperity of the semiconductor-related industry.

This sub-index shows that the pricing pressures within the tech manufacturing sector are not driven purely by costs, but also by strong demand-side factors, providing additional support for the overall Producer Price Index.

Bank of Korea Hawkish Signal Becomes Clearer

Faced with concurrent inflationary pressures and financial stability risks, the Bank of Korea's policy stance is increasingly tilting towards hawkishness.

While the central bank held rates steady during the May meeting, it clearly signaled a tightening bias; meeting minutes published this week further showed that support for this stance has widened within the committee.

Persistent producer price increases usually pass through to consumer prices after several months; if this path continues, it will provide the Bank of Korea with stronger grounds for future rate hikes. Investors should closely monitor subsequent inflation data and central bank statements.