Japan’s Nikkei stock fell on Thursday, dragged down by technology stocks on persistent valuation concerns, joining a broader slump in Asian markets on concerns about the exploding costs of AI investments.The benchmark Nikkei 225 Index fell 0.9% to 53,818.04. The broader, less tech-intensive Topix fell a more moderate 0.1% to 3,652.41. SoftBank Group fell 7% […]