We want to hear from you! Please complete our survey: 2025 ABC News Daily Audience SurveyChip making giant Nvidia’s value hit $5 trillion US last week, a milestone that just a few years ago was unthinkable.Two other tech giants have hit the $4 trillion US mark as excitement about the promise of AI drives investor interest. But in an uncertain world are the sky-high valuations sustainable, or a bubble that will soon bust? Today, the ABC’s chief business correspondent Ian Verrender on why this might not be a bubble that bursts like the dot-com crash of the early-2000s. Featured: Ian Verrender, ABC Chief Business Correspondent