The Globe and Mail reports in its Saturday edition that stock markets are on a roll. The Globe's Ian McGugan writes that forget the Strait of Hormuz, forget rising inflation. RBC, HSBC and Yardeni Research have hiked their year-end targets for the S&P 500. Yes, as hard as it is to stop dancing, prudent investors may want to start thinking about planning their rides home. After three years of top performance, the market is looking pricey. It is also looking increasingly unbalanced. Rather than spreading its risk widely, it is wagering huge amounts on a single bet on technology. As Barron's noted this week, the tech sector has never been more dominant in the S&P 500 index, not even at the height of the dotcom boom of the 1990s. The sector, narrowly defined, now accounts for 37 per cent of the market benchmark's value. Add in tech-adjacent companies such as Meta, Amazon and Alphabet, and the tech sector, broadly defined, makes up about half of the S&P's market capitalization. It is not clear how the big tech investors, or hyperscalers, such as Alphabet and Meta, will generate a payback on their investments of hundreds of billions of dollars -- or how AI will result in any surge in corporate productivity.