Commitments for AI spending should sustain the investment theme around the technology for two to three years, even as tech giants gradually turn cash-flow negative and start raising debt to fund their buildouts, according to BlackRock Inc.’s Helen Jewell. The biggest U.S. tech firms are planning to spend more than $700 billion this year on data centers, specialized chips, and networking equipment to support their artificial intelligence plans, with that number approaching $1 trillion for 2027.