TOKYO -- As Japanese and U.S. shares reach new highs fueled by the tech sector, strong earnings have allayed concerns about overheating, but the concentration of money in a handful of stocks has invited comparisons to the 1990s dot-com boom.
The Nikkei Stock Average broke the 40,000 mark for the first time Monday, following record highs set by the tech-heavy Nasdaq index in the U.S. last week. Bullishness about artificial intelligence has lifted American stocks, creating a ripple effect in Japan and elsewhere that shows no sign of abating.
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