South Korea inflation Report Interpretation

Overview

This macro event note examines South Korea’s July CPI release. Goldman Sachs highlights softer headline inflation driven by goods prices, while services and core inflation showed modestly firmer sequential momentum.

Core views

South Korea’s headline CPI inflation fell to 2.8% year-on-year in July from 3.2% in the previous month. The result was slightly below the 2.9% Bloomberg consensus and matched Goldman Sachs’ 2.8% forecast. Goldman Sachs notes that this was the first headline inflation reading below consensus since April. On its seasonally adjusted measure, headline CPI fell 0.2% month-on-month after rising 0.3% in the prior month, marking the first negative sequential momentum since August 2025. The headline slowdown was led by goods prices, which dropped 0.6% month-on-month. Agricultural-goods prices fell 1.6%, while industrial-goods prices declined 0.3%. Within industrial goods, modest price increases for processed food and durable goods were outweighed by a 7.9% fall in oil-product prices. The report attributes that oil-product decline to government measures intended to accelerate downward price adjustments. Services prices moved in the other direction, rising 0.3% month-on-month after being almost flat in the prior month. Eating-out prices maintained a 0.2% increase, while other personal services, including accommodation, rebounded 0.3% after a slight prior-month decline. Public-service costs rose 0.2%, broadly unchanged in momentum, and housing-cost momentum edged up to 0.2% from 0.1%. Against this firmer services backdrop, core CPI momentum accelerated to 0.3% month-on-month on Goldman Sachs’ seasonally adjusted basis, from 0.2% previously. Core CPI inflation, excluding food and energy, consequently edged up to 2.6% year-on-year from 2.5%. The report therefore distinguishes between a goods-driven easing in headline inflation and modest strengthening in underlying core and services inflation.

Analysis framework

Goldman Sachs compares the July headline CPI outcome with its own forecast, Bloomberg consensus and the prior month, then decomposes seasonally adjusted monthly inflation into goods and services. It further separates food and energy from core CPI to assess underlying price momentum.

Methodology notes

• Industry AnalysisVolume-price decomposition

  CPI component decomposition by goods, services and core inflation

  The report breaks the headline CPI change into goods and services movements, then uses core CPI excluding food and energy to show that the headline decline did not fully reflect underlying price momentum.

Key data

• July headline CPI inflation2.8% yoyDown from 3.2% yoy in the prior month; Bloomberg consensus was 2.9% yoy and Goldman Sachs forecast was 2.8% yoy.
• Headline CPI sequential momentum-0.2% mom saDown from +0.3% in the prior month; first negative momentum since August 2025.
• Goods prices-0.6% mom saAgricultural goods fell 1.6%; industrial goods fell 0.3%; oil-product prices fell 7.9%.
• Services prices+0.3% mom saAfter being almost flat in the prior month.
• July core CPI inflation2.6% yoyUp from 2.5% yoy; sequential momentum accelerated to +0.3% mom sa from +0.2%.

Impact & implications

The report indicates that July’s headline inflation decline was principally a goods-price development, while the rebound in services costs contributed to a modest increase in core inflation and underlying sequential momentum.