South Korea's Kospi has risen over 80% this year: excluding Samsung and SK Hynix, the increase is less than 30%.

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The dazzling rise of the South Korean stock market this year cannot withstand careful scrutiny.

Kospi has risen 80% year-to-date, far surpassing the 7% gain of the MSCI World Developed Market Index and the 23% gain of the MSCI Emerging Markets Index. However, Samsung Electronics and SK Hynix contributed the vast majority of this remarkable rise—once these two stocks are excluded, the overall gain plummets to around 30%.

According to Bloomberg columnist Jonathan Levin's analysis, the highly concentrated market structure has, in effect, turned Kospi into a "semiconductor single-industry index," an industry notorious for violent cyclical fluctuations—prosperous in booms, equally painful in downturns. This structural risk not only exposes ordinary investors to extremely high concentration risk but also triggers public doubts about President Lee Jae-myung's aggressive policy to encourage mass stock market participation.

Historical data shows Kospi’s returns are highly uneven. Since 1990, it has reached historic highs only 264 times, with the longest period without a new high exceeding ten years, whereas the S&P 500 hit new highs 780 times over the same period. This "bumpy" performance makes it hard for the market to reliably play a role in long-term household wealth accumulation.

The Two Giants Dominate: AI Boom Magnifies Concentration Risk

The chip boom fueled by exploding demand for artificial intelligence has taken the concentration problem in the Korean stock market to the extreme. Bloomberg data shows that the weighting of electronics and electrical equipment in the Kospi has continued to climb in recent years, with the index becoming increasingly dependent on the semiconductor industry.

Concentration is a double-edged sword for investors: when lucky, betting on a few correct targets can significantly outperform the benchmark index—a fact tech-focused investors of the past five years know well. But once the economic cycle turns, risks are suddenly exposed. In the long run, few professionals or retail investors can consistently beat the market through stock-picking.

The cyclical nature of the semiconductor industry is a major structural risk at present. The industry’s profits have always been extremely volatile, with brief booms usually followed by excessive supply and severely squeezed margins. Jonathan Levin previously pointed out that the profits of global semiconductor companies are remarkably prone to dramatic rises and falls, with excess supply and contracting profits often following the boom.

Although current strong AI demand is providing solid support for memory chip makers like SK Hynix and Samsung Electronics, and they may still have upside, the cyclical nature of the industry means good times rarely last. Once the cycle turns down, a market highly concentrated in a single industry will be hit especially hard.

Bumpy Returns, Hardly Ideal for Wealth Accumulation

Kospi’s historical performance reveals a deep problem: it’s a market with extremely uneven returns. Bloomberg data shows that since early 1990 the compound annual growth rate of the index is around 7.3%, yet almost all capital appreciation occurred in around 10 to 11 years—in other words, the index spent less than a third of the time reaching new highs, with the majority of the time spent flat or even declining. By contrast, the S&P 500 set 780 new historical highs in the same period, highlighting the maturity of the U.S. retail investment culture and the long-term upward trend of the market.

This "bumpy" return path is especially disadvantageous to ordinary investors. Jonathan Levin points out that human nature abhors losses, and when portfolios swing violently, investors tend to buy and sell frequently at the wrong times. Only when a portfolio keeps a relatively steady upward trend can investors truly overcome emotional impulses and stay invested for the long run.

Mass Participation: Nurturing Investors or Encouraging Speculation?

Lee Jae-myung’s push for mass market participation includes the policy goal of Kospi breaking the 5,000-point mark, publicly casting himself as an "ant" (the popular nickname for Korean retail investors) and even declaring himself "the big ant." Jonathan Levin argues that this kind of policy stance, couched in day-trading language, inevitably raises the question: is Lee aiming to nurture a responsible investment culture, or to foster a nation of speculators?

From a policy design perspective, South Korea's current tax incentives for long-term holdings are significantly weaker than the U.S., and investment limits are more conservative. At the same time, the most popular ETF products among Korean retail investors are often leveraged products using derivatives to amplify daily moves—meaning once the market swings or declines for a while, downside risks can be enormous.

A Long Road to Reform, Diversification as the Only Long-Term Solution

Recent corporate governance reforms by the Korean government aim to strengthen protection of small and medium shareholders’ rights, and have some substantive significance. But Jonathan Levin believes that to truly build a long-term, stable investment culture for the public, much larger steps are needed in the tax incentive mechanism and encouraging more companies to go public.

Structurally, the Korean economy has long been dominated by family-controlled chaebol groups, whose size far exceeds all other enterprises, and reducing their influence will take decades at least. In this context, encouraging Korean investors to create truly diversified portfolios—including allocating a significant share to overseas markets—may be the most pragmatic choice for now.

However, Lee Jae-myung is doing the opposite: criticizing overseas stock investments, making domestic investments a matter of patriotism. Jonathan Levin believes this policy approach not only fails to support Koreans’ long-term wealth accumulation but also makes the stock market’s current dazzling performance even more fragile. History shows Kospi’s phase excess returns are rarely sustainable; without fundamental market reform, diversification—including overseas allocation—remains the most important principle for South Korean retail investors.

Risk DisclaimerThe market carries risks; investment should be cautious. This article does not constitute personal investment advice, nor does it take individual users' specific investment goals, financial situation, or needs into consideration. Users should consider whether any opinions, views, or conclusions in this article are suitable for their specific circumstances. Investment is at your own risk. ```