South Korea stocks crashed 18% in two days. Could it happen here?

Market Overview - South Korea's stock market experienced a significant selloff following the Mideast conflict, with the benchmark Kospi Index dropping more than 12% in a single day, marking its worst trading day ever [2][3] - The Kospi has declined over 18% this week, indicating the potential for its largest weekly loss since 2008 [3] Market Concentration - The concentration of the Korean stock market is notably high, with over one-third of the index comprised of Samsung Electronics and SK Hynix, compared to 14% for Nvidia and Apple in the S&P 500 [4][5] - This concentration raises concerns about market stability, especially given the recent sharp corrections in stock prices [4][6] Stock Performance - Samsung Electronics has seen a 216% increase over the past year, while SK Hynix has surged 356%, indicating that both stocks are "extremely extended" [6] - Despite the recent turmoil, the Kospi is still up more than 20% in 2026 and has doubled over the past 12 months, contrasting with the S&P 500's minimal change in 2026 [9] Trading Dynamics - Both Samsung Electronics and SK Hynix experienced declines of 10% or more in a single trading session, leading to temporary trading suspensions on the Korea Exchange [7] - The U.S. market, characterized by broader diversification and circuit-breakers, is less susceptible to such drastic declines, highlighting the volatility in the Korean market [8] Economic Context - South Korea is the 14th largest economy globally, surpassing countries like Australia, the Netherlands, and Saudi Arabia, which underscores its significance in the global market [11]