AI chip exports drive South Korea's above-forecast Q3 GDP growth of 1.0%

The extent of the GDP beat and the resulting sidecar halt on the KOSPI highlight how much South Korean equities are now linked to the AI chip cycle. This creates a double-edged situation: it benefits exporters and chip companies while worldwide AI demand remains strong, but leaves the market vulnerable to any disruption in global AI commerce. The GDP figures strengthen the Bank of Korea's inclination toward tighter policy following its rate increases in July and September, which should help the won and sustain pressure on short-term bond yields. Lingering weak consumption provides the chief case against additional rate hikes, meaning household-facing industries are expected to remain behind.

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South Korea's AI chip-led growth has triggered market circuit-breakers while households remain on the sidelines.

Summary:

• South Korea's Q3 GDP increased 1.0% quarter-on-quarter, above the 0.7% median forecast and accelerating from 0.6% in Q2; year-on-year growth came in at 3.4%, higher than the 3.0% consensus.
• The central bank reckons semiconductors account for roughly half of economic expansion; if Q4 output stays at Q3 levels, annual growth would be about 3.7%.
• Exports picked up 2.3% and facilities spending surged 4.1%, mainly on chip equipment.
• Household spending dipped 0.2%, its first fall in almost four years, weighed down by a stock market decline and automotive labor disputes.
• Exports exceeded $800 billion in the first nine months and are set to surpass $1 trillion this year.
• A sharp rally in the KOSPI triggered a sidecar, briefly suspending program trading to temper orders driven by momentum.

On Tuesday, advance data from the Bank of Korea revealed that the South Korean economy expanded more rapidly than anticipated in the third quarter, supported by the global AI chip surge boosting exports and capital spending, even as sluggish household consumption stood out as a weak area. GDP increased by 1.0% quarter-on-quarter, surpassing the 0.7% median projection from a Reuters survey and quickening from 0.6% in Q2.

South Korean shares climbed briskly in the session, and the KOSPI's surge set off a sidecar, a short suspension of program trading that the Korea Exchange imposes when index futures move sharply, intended to curb momentum-led orders.

The margin of the GDP beat was remarkable compared to the central bank's own projections. In August, the Bank of Korea had predicted 0.3% quarterly growth and 3.3% for the full year. If fourth-quarter GDP merely matches the third quarter's level, the annual growth rate would be approximately 3.7%. An official at the central bank indicated that semiconductors contribute roughly half of the economic expansion.

Export volumes gained 2.3% in Q3 due to demand for semiconductors, machinery, and electrical equipment, while capital spending on facilities soared 4.1%, mainly for chip-making equipment. South Korea's exports exceeded $800 billion in January-September, surpassing the previous full-year record set last year, and positioning the nation to become just the fourth country to surpass $1 trillion in exports in a year, following the United States, China, and Germany.

Consumption remains the soft spot. Private expenditure decreased by 0.2%, the first drop in close to four years, as activity in financial services shrank during a stock market downturn and vehicle purchases declined because of strikes at key auto manufacturers. The central bank anticipates a gradual pickup as semiconductor companies' dividend distributions in Q4 and staff bonuses in early next year boost household earnings, but an economist warned that a weak jobs market and tight borrowing costs restrain the potential for a robust recovery. Additionally, consumer confidence fell in October.

The Bank of Korea left interest rates unchanged last week following consecutive increases in July and September, maintaining a hawkish posture, and the latest GDP figures provide scant justification for easing. Year-on-year, GDP expanded 3.4%, also surpassing the 3.0% forecast.