MW One quadrillion is the number used to describe the wealth effect of South Korea's stock-market miracle

By Jules Rimmer

The KOSPI's breathtaking 2026 rally has generated capital gains in excess of 1 quadrillion won

South Korean spending may be boosted by its stock-market gains.

While traders and investors marvel at the unprecedented surge in Korean equities over the last year, JPMorgan's equity research team has been calculating just what those astonishing returns mean for household wealth across Asia's fourth-largest economy.

Korea households' estimated stock capital gains

The team estimates that those households have accumulated more than 1 quadrillion won (USDKRW) ($652 billion) in capital gains in 2026 alone and under an optimistic scenario, this could create a wealth effect of 43 trillion won ($28 billion).

The wealth effect is the behavioral economic theory that contends people spend more as the value of their assets increase. Higher perceived net worth improves confidence and makes purchases of big-ticket items feel more affordable. It can also encourage consumers to borrow more, fueling further expenditure.

The knock-on effect of these newly-acquired riches should be extremely supportive for domestic consumption within South Korea, more than likely benefiting the luxury discretionary categories versus staples and or fast-moving consumer goods where JPMorgan reckons "demand is typically less wealth-sensitive and more exposed to cyclical and competitive pressures."

These forecasts were outlined Thursday in a note from JPMorgan's Korean equity team, headed up by Stanley Yang. The report noted that past booms in the Korean market had an average consumption conversion rate of 1.3% but this time around that figure could be markedly higher.

KOSPI vs private consumption

Yang and team suggest that figure could be more like 4% (the higher end of Western benchmarks, they observe) given how steep and fast this rally has been, how retail investors have been especially active in this recent period and due to the restrictions placed by the Korean government on the reallocation of stock-market profits into real-estate purchases.

To give some impression of how meaningful these numbers could be, the JPMorgan team assesses the wealth contribution from share price appreciation to reach the equivalent of 1.6% of GDP. For example, that's 22% of the size of the Korean e-commerce market's gross merchandise value.

That statistic is interesting because the shares of Korea's dominant e-commerce giant, Coupang $(CPNG)$ (often referred to as Korea's equivalent of Amazon) has struggled in 2026. Its stock, listed in the U.S., has slumped 30%, hugely underperforming the broader market, after a data scandal.

Online competitor Naver Shopping (KR:035420), more focused on discretionary consumption, has also struggled and has managed just a 5% advance year-to-date.

Predicting how this windfall could be spent, JPMorgan identifies sectors like department stores, travel and hotels (sectors not under JPMorgan research coverage) while those parts of the market it does cover (like advertising, e-commerce, consumer value stores, autos and banks) should benefit but, in all likelihood, more modestly.

The report acknowledges that the index gains may not be fully represented in the bank accounts of domestic retail investors because so much of the KOSPI's performance has been contributed by just two names - Samsung Electronics (KR:005930) and SK Hynix (KR:000660). Shareholder breakdowns persuade Yang that retail investors may only own 15% to 20% of these two heavyweights.

In Friday's trading in Seoul, the KOSPI KR:180721 fell nearly 6%, after U.S. microchip stocks slumped on Thursday.

-Jules Rimmer

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June 05, 2026 03:27 ET (07:27 GMT)

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