South Korea's roller-coaster stock market in July has prompted calls for tighter scrutiny of overly bullish brokerage research and stricter margin-lending rules

South Korea's KOSPI shed $2.18 trillion in two days as AI chip stocks crashed, crushing leveraged retail investors and triggering regulatory

Kospi skyrocketed over 122% since the beginning of the year to hit a lifetime high of 9,386 in June on the back of a global AI frenzy, before things began to go downhill. While…