A ghost in an AI costumeFor twenty years, every comparison to the dot-com bubble has ultimately failed. Yet the latest charts are becoming harder to ignore. Valuations are at their richest levels since 2000, tech's dominance is at a record, and AI now appears responsible for most of the market's wealth creation. Is this the next great productivity boom—or simply the ghost of 2000 wearing an AI costume?Highest since 2000