Stock markets closed another volatile week in the red, as investor sentiment soured on the very theme that has pushed markets to record highs: artificial intelligence (AI).Attention shifted from earnings and revenue beats to the soaring cost of AI capital spending, casting doubts about...

U.S. technology shares reversed course this week, giving up all the gains they made the previous week. Profit-taking and concerns about AI competition from China and whether AI investment returns will meet expectations hit the semiconductor sector, pushing it into bear territory.The sell-off in...