World shares are mixed and South Korea's Kospi share index falls 6%, while oil prices surge

World shares were mixed while South Korea’s Kospi stock index dropped 6% Wednesday as doubts over massive investments in artificial intelligence once again led investors to dump chipmakers' shares. Britain's FTSE 100 edged 0.1% lower to 10,865.48. The latest rout in Seoul was led by a plunge in shares in chipmaker SK Hynix after its operating profit in the last quarter fell short of analysts’ forecasts even though it soared nearly sixfold.