The volatile state of South Korean stocks is reminiscent for some investors of China’s rapid boom-to-bust cycle a decade ago, analysts say, when leveraged trading fuelled a meltdown that eventually wiped US$5 trillion from the market within months. The South Korean stock market’s frantic artificial intelligence trade has many similarities to China’s markets in 2015, when record-high outstanding margin debts and a retail frenzy led to government intervention that eventually deflated the stock...